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Finding the Fourth Proportional to 15,881.63, 21,915.92 and 8,807.90

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Solution

The fourth proportional to 15,881.63, 21,915.92 and 8,807.90 is: 12,154.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,881.63 : 21,915.92 = 8,807.90 : x
  2. Step 2: Convert to fraction form
    15,881.63/21,915.92 = 8,807.90/x
  3. Step 3: Cross multiply
    15,881.63x = 21,915.92 × 8,807.90
  4. Step 4: Simplify right side
    15,881.63x = 193,033,187.73
  5. Step 5: Solve for x
    x = 193,033,187.73/15,881.63
  6. Step 6: Final answer
    x = 12,154.49

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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.