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Finding the Fourth Proportional to 457,685.20, 686,592.60 and 142,109.20

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Solution

The fourth proportional to 457,685.20, 686,592.60 and 142,109.20 is: 213,183.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,685.20 : 686,592.60 = 142,109.20 : x
  2. Step 2: Convert to fraction form
    457,685.20/686,592.60 = 142,109.20/x
  3. Step 3: Cross multiply
    457,685.20x = 686,592.60 × 142,109.20
  4. Step 4: Simplify right side
    457,685.20x = 97,571,125,111.92
  5. Step 5: Solve for x
    x = 97,571,125,111.92/457,685.20
  6. Step 6: Final answer
    x = 213,183.92

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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.