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Finding the Fourth Proportional to 15,686.76, 21,644.90 and 8,880.74

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Solution

The fourth proportional to 15,686.76, 21,644.90 and 8,880.74 is: 12,253.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,686.76 : 21,644.90 = 8,880.74 : x
  2. Step 2: Convert to fraction form
    15,686.76/21,644.90 = 8,880.74/x
  3. Step 3: Cross multiply
    15,686.76x = 21,644.90 × 8,880.74
  4. Step 4: Simplify right side
    15,686.76x = 192,222,729.23
  5. Step 5: Solve for x
    x = 192,222,729.23/15,686.76
  6. Step 6: Final answer
    x = 12,253.82

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Half scale
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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.