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Finding the Fourth Proportional to 18,957.72, 28,436.56 and 8,425.29

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Solution

The fourth proportional to 18,957.72, 28,436.56 and 8,425.29 is: 12,637.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,957.72 : 28,436.56 = 8,425.29 : x
  2. Step 2: Convert to fraction form
    18,957.72/28,436.56 = 8,425.29/x
  3. Step 3: Cross multiply
    18,957.72x = 28,436.56 × 8,425.29
  4. Step 4: Simplify right side
    18,957.72x = 239,586,264.60
  5. Step 5: Solve for x
    x = 239,586,264.60/18,957.72
  6. Step 6: Final answer
    x = 12,637.93

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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.