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Finding the Fourth Proportional to 518,507.36, 715,535.88 and 289,061.90

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Solution

The fourth proportional to 518,507.36, 715,535.88 and 289,061.90 is: 398,903.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,507.36 : 715,535.88 = 289,061.90 : x
  2. Step 2: Convert to fraction form
    518,507.36/715,535.88 = 289,061.90/x
  3. Step 3: Cross multiply
    518,507.36x = 715,535.88 × 289,061.90
  4. Step 4: Simplify right side
    518,507.36x = 206,834,160,990.97
  5. Step 5: Solve for x
    x = 206,834,160,990.97/518,507.36
  6. Step 6: Final answer
    x = 398,903.04

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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.