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Finding the Fourth Proportional to 11,157.01, 15,412.70 and 8,915.95

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Solution

The fourth proportional to 11,157.01, 15,412.70 and 8,915.95 is: 12,316.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,157.01 : 15,412.70 = 8,915.95 : x
  2. Step 2: Convert to fraction form
    11,157.01/15,412.70 = 8,915.95/x
  3. Step 3: Cross multiply
    11,157.01x = 15,412.70 × 8,915.95
  4. Step 4: Simplify right side
    11,157.01x = 137,418,862.57
  5. Step 5: Solve for x
    x = 137,418,862.57/11,157.01
  6. Step 6: Final answer
    x = 12,316.82

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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.