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Finding the Fourth Proportional to 285,637.88, 428,516.76 and 85,972.88

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Solution

The fourth proportional to 285,637.88, 428,516.76 and 85,972.88 is: 128,977.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,637.88 : 428,516.76 = 85,972.88 : x
  2. Step 2: Convert to fraction form
    285,637.88/428,516.76 = 85,972.88/x
  3. Step 3: Cross multiply
    285,637.88x = 428,516.76 × 85,972.88
  4. Step 4: Simplify right side
    285,637.88x = 36,840,819,985.47
  5. Step 5: Solve for x
    x = 36,840,819,985.47/285,637.88
  6. Step 6: Final answer
    x = 128,977.36

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1.5x scale

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.