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Finding the Fourth Proportional to 15,151.76, 20,915.88 and 10,186.64

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Solution

The fourth proportional to 15,151.76, 20,915.88 and 10,186.64 is: 14,061.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,151.76 : 20,915.88 = 10,186.64 : x
  2. Step 2: Convert to fraction form
    15,151.76/20,915.88 = 10,186.64/x
  3. Step 3: Cross multiply
    15,151.76x = 20,915.88 × 10,186.64
  4. Step 4: Simplify right side
    15,151.76x = 213,062,539.84
  5. Step 5: Solve for x
    x = 213,062,539.84/15,151.76
  6. Step 6: Final answer
    x = 14,061.90

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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.