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Finding the Fourth Proportional to 100,728.71, 138,998.76 and 58,293.62

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Solution

The fourth proportional to 100,728.71, 138,998.76 and 58,293.62 is: 80,441.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,728.71 : 138,998.76 = 58,293.62 : x
  2. Step 2: Convert to fraction form
    100,728.71/138,998.76 = 58,293.62/x
  3. Step 3: Cross multiply
    100,728.71x = 138,998.76 × 58,293.62
  4. Step 4: Simplify right side
    100,728.71x = 8,102,740,895.91
  5. Step 5: Solve for x
    x = 8,102,740,895.91/100,728.71
  6. Step 6: Final answer
    x = 80,441.23

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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.