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Finding the Fourth Proportional to 457,681.80, 686,522.70 and 142,136.20

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Solution

The fourth proportional to 457,681.80, 686,522.70 and 142,136.20 is: 213,204.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,681.80 : 686,522.70 = 142,136.20 : x
  2. Step 2: Convert to fraction form
    457,681.80/686,522.70 = 142,136.20/x
  3. Step 3: Cross multiply
    457,681.80x = 686,522.70 × 142,136.20
  4. Step 4: Simplify right side
    457,681.80x = 97,579,727,791.74
  5. Step 5: Solve for x
    x = 97,579,727,791.74/457,681.80
  6. Step 6: Final answer
    x = 213,204.30

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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.