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Finding the Fourth Proportional to 113,336,728.40, 169,721,657.40 and 90,661,912.40

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Solution

The fourth proportional to 113,336,728.40, 169,721,657.40 and 90,661,912.40 is: 135,766,139.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,336,728.40 : 169,721,657.40 = 90,661,912.40 : x
  2. Step 2: Convert to fraction form
    113,336,728.40/169,721,657.40 = 90,661,912.40/x
  3. Step 3: Cross multiply
    113,336,728.40x = 169,721,657.40 × 90,661,912.40
  4. Step 4: Simplify right side
    113,336,728.40x = 15,387,290,035,581,614
  5. Step 5: Solve for x
    x = 15,387,290,035,581,614/113,336,728.40
  6. Step 6: Final answer
    x = 135,766,139.12

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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.