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Finding the Fourth Proportional to 100,135.50, 138,189.15 and 55,423.50

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Solution

The fourth proportional to 100,135.50, 138,189.15 and 55,423.50 is: 76,485.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,135.50 : 138,189.15 = 55,423.50 : x
  2. Step 2: Convert to fraction form
    100,135.50/138,189.15 = 55,423.50/x
  3. Step 3: Cross multiply
    100,135.50x = 138,189.15 × 55,423.50
  4. Step 4: Simplify right side
    100,135.50x = 7,658,926,355.03
  5. Step 5: Solve for x
    x = 7,658,926,355.03/100,135.50
  6. Step 6: Final answer
    x = 76,485.63

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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.