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Finding the Fourth Proportional to 90,472.32, 135,920.55 and 85,359.94

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Solution

The fourth proportional to 90,472.32, 135,920.55 and 85,359.94 is: 128,240.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,472.32 : 135,920.55 = 85,359.94 : x
  2. Step 2: Convert to fraction form
    90,472.32/135,920.55 = 85,359.94/x
  3. Step 3: Cross multiply
    90,472.32x = 135,920.55 × 85,359.94
  4. Step 4: Simplify right side
    90,472.32x = 11,602,169,973.07
  5. Step 5: Solve for x
    x = 11,602,169,973.07/90,472.32
  6. Step 6: Final answer
    x = 128,240.00

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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.