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Finding the Fourth Proportional to 390,926.20, 586,445.20 and 124,689.72

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Solution

The fourth proportional to 390,926.20, 586,445.20 and 124,689.72 is: 187,052.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,926.20 : 586,445.20 = 124,689.72 : x
  2. Step 2: Convert to fraction form
    390,926.20/586,445.20 = 124,689.72/x
  3. Step 3: Cross multiply
    390,926.20x = 586,445.20 × 124,689.72
  4. Step 4: Simplify right side
    390,926.20x = 73,123,687,783.34
  5. Step 5: Solve for x
    x = 73,123,687,783.34/390,926.20
  6. Step 6: Final answer
    x = 187,052.41

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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.