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Finding the Fourth Proportional to 457,811.60, 686,717.40 and 390,160.40

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Solution

The fourth proportional to 457,811.60, 686,717.40 and 390,160.40 is: 585,240.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,811.60 : 686,717.40 = 390,160.40 : x
  2. Step 2: Convert to fraction form
    457,811.60/686,717.40 = 390,160.40/x
  3. Step 3: Cross multiply
    457,811.60x = 686,717.40 × 390,160.40
  4. Step 4: Simplify right side
    457,811.60x = 267,929,935,470.96
  5. Step 5: Solve for x
    x = 267,929,935,470.96/457,811.60
  6. Step 6: Final answer
    x = 585,240.60

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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.