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Finding the Fourth Proportional to 15,572.80, 21,490.98 and 8,499.60

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Solution

The fourth proportional to 15,572.80, 21,490.98 and 8,499.60 is: 11,729.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,572.80 : 21,490.98 = 8,499.60 : x
  2. Step 2: Convert to fraction form
    15,572.80/21,490.98 = 8,499.60/x
  3. Step 3: Cross multiply
    15,572.80x = 21,490.98 × 8,499.60
  4. Step 4: Simplify right side
    15,572.80x = 182,664,733.61
  5. Step 5: Solve for x
    x = 182,664,733.61/15,572.80
  6. Step 6: Final answer
    x = 11,729.73

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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.