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Finding the Fourth Proportional to 12,915.42, 17,818.97 and 7,249.20

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Solution

The fourth proportional to 12,915.42, 17,818.97 and 7,249.20 is: 10,001.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.42 : 17,818.97 = 7,249.20 : x
  2. Step 2: Convert to fraction form
    12,915.42/17,818.97 = 7,249.20/x
  3. Step 3: Cross multiply
    12,915.42x = 17,818.97 × 7,249.20
  4. Step 4: Simplify right side
    12,915.42x = 129,173,241.08
  5. Step 5: Solve for x
    x = 129,173,241.08/12,915.42
  6. Step 6: Final answer
    x = 10,001.47

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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.