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Finding the Fourth Proportional to 19,286.40, 28,915.20 and 10,531.20

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Solution

The fourth proportional to 19,286.40, 28,915.20 and 10,531.20 is: 15,788.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,286.40 : 28,915.20 = 10,531.20 : x
  2. Step 2: Convert to fraction form
    19,286.40/28,915.20 = 10,531.20/x
  3. Step 3: Cross multiply
    19,286.40x = 28,915.20 × 10,531.20
  4. Step 4: Simplify right side
    19,286.40x = 304,511,754.24
  5. Step 5: Solve for x
    x = 304,511,754.24/19,286.40
  6. Step 6: Final answer
    x = 15,788.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.