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Finding the Fourth Proportional to 12,572.72, 18,715.36 and 12,385.88

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Solution

The fourth proportional to 12,572.72, 18,715.36 and 12,385.88 is: 18,437.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,572.72 : 18,715.36 = 12,385.88 : x
  2. Step 2: Convert to fraction form
    12,572.72/18,715.36 = 12,385.88/x
  3. Step 3: Cross multiply
    12,572.72x = 18,715.36 × 12,385.88
  4. Step 4: Simplify right side
    12,572.72x = 231,806,203.12
  5. Step 5: Solve for x
    x = 231,806,203.12/12,572.72
  6. Step 6: Final answer
    x = 18,437.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.