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Finding the Fourth Proportional to 86,490.20, 129,735.30 and 72,493.40

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Solution

The fourth proportional to 86,490.20, 129,735.30 and 72,493.40 is: 108,740.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,490.20 : 129,735.30 = 72,493.40 : x
  2. Step 2: Convert to fraction form
    86,490.20/129,735.30 = 72,493.40/x
  3. Step 3: Cross multiply
    86,490.20x = 129,735.30 × 72,493.40
  4. Step 4: Simplify right side
    86,490.20x = 9,404,952,997.02
  5. Step 5: Solve for x
    x = 9,404,952,997.02/86,490.20
  6. Step 6: Final answer
    x = 108,740.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.