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Finding the Fourth Proportional to 9,915.20, 14,851.20 and 8,619.20

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Solution

The fourth proportional to 9,915.20, 14,851.20 and 8,619.20 is: 12,910.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,915.20 : 14,851.20 = 8,619.20 : x
  2. Step 2: Convert to fraction form
    9,915.20/14,851.20 = 8,619.20/x
  3. Step 3: Cross multiply
    9,915.20x = 14,851.20 × 8,619.20
  4. Step 4: Simplify right side
    9,915.20x = 128,005,463.04
  5. Step 5: Solve for x
    x = 128,005,463.04/9,915.20
  6. Step 6: Final answer
    x = 12,910.02

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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.