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Finding the Fourth Proportional to 15,881.13, 21,915.09 and 8,807.13

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Solution

The fourth proportional to 15,881.13, 21,915.09 and 8,807.13 is: 12,153.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,881.13 : 21,915.09 = 8,807.13 : x
  2. Step 2: Convert to fraction form
    15,881.13/21,915.09 = 8,807.13/x
  3. Step 3: Cross multiply
    15,881.13x = 21,915.09 × 8,807.13
  4. Step 4: Simplify right side
    15,881.13x = 193,009,046.59
  5. Step 5: Solve for x
    x = 193,009,046.59/15,881.13
  6. Step 6: Final answer
    x = 12,153.36

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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.