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Finding the Fourth Proportional to 390,911.68, 586,463.04 and 124,672.24

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Solution

The fourth proportional to 390,911.68, 586,463.04 and 124,672.24 is: 187,038.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,911.68 : 586,463.04 = 124,672.24 : x
  2. Step 2: Convert to fraction form
    390,911.68/586,463.04 = 124,672.24/x
  3. Step 3: Cross multiply
    390,911.68x = 586,463.04 × 124,672.24
  4. Step 4: Simplify right side
    390,911.68x = 73,115,660,874.01
  5. Step 5: Solve for x
    x = 73,115,660,874.01/390,911.68
  6. Step 6: Final answer
    x = 187,038.82

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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.