Home / 100,000.76-137,995.98-55,280.12

Finding the Fourth Proportional to 100,000.76, 137,995.98 and 55,280.12

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Solution

The fourth proportional to 100,000.76, 137,995.98 and 55,280.12 is: 76,283.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,000.76 : 137,995.98 = 55,280.12 : x
  2. Step 2: Convert to fraction form
    100,000.76/137,995.98 = 55,280.12/x
  3. Step 3: Cross multiply
    100,000.76x = 137,995.98 × 55,280.12
  4. Step 4: Simplify right side
    100,000.76x = 7,628,434,333.92
  5. Step 5: Solve for x
    x = 7,628,434,333.92/100,000.76
  6. Step 6: Final answer
    x = 76,283.76

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Half scale
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Double scale
Find fourth proportional to 100,001.76, 137,997.36 and 55,281.12
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.