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Finding the Fourth Proportional to 100,900.67, 139,243.85 and 55,578.80

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Solution

The fourth proportional to 100,900.67, 139,243.85 and 55,578.80 is: 76,699.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,900.67 : 139,243.85 = 55,578.80 : x
  2. Step 2: Convert to fraction form
    100,900.67/139,243.85 = 55,578.80/x
  3. Step 3: Cross multiply
    100,900.67x = 139,243.85 × 55,578.80
  4. Step 4: Simplify right side
    100,900.67x = 7,739,005,116.27
  5. Step 5: Solve for x
    x = 7,739,005,116.27/100,900.67
  6. Step 6: Final answer
    x = 76,699.25

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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.