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Finding the Fourth Proportional to 15,472.70, 21,352.80 and 8,758.20

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Solution

The fourth proportional to 15,472.70, 21,352.80 and 8,758.20 is: 12,086.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,472.70 : 21,352.80 = 8,758.20 : x
  2. Step 2: Convert to fraction form
    15,472.70/21,352.80 = 8,758.20/x
  3. Step 3: Cross multiply
    15,472.70x = 21,352.80 × 8,758.20
  4. Step 4: Simplify right side
    15,472.70x = 187,012,092.96
  5. Step 5: Solve for x
    x = 187,012,092.96/15,472.70
  6. Step 6: Final answer
    x = 12,086.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.