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Finding the Fourth Proportional to 9,915.68, 14,869.65 and 4,981.88

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Solution

The fourth proportional to 9,915.68, 14,869.65 and 4,981.88 is: 7,470.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,915.68 : 14,869.65 = 4,981.88 : x
  2. Step 2: Convert to fraction form
    9,915.68/14,869.65 = 4,981.88/x
  3. Step 3: Cross multiply
    9,915.68x = 14,869.65 × 4,981.88
  4. Step 4: Simplify right side
    9,915.68x = 74,078,756.28
  5. Step 5: Solve for x
    x = 74,078,756.28/9,915.68
  6. Step 6: Final answer
    x = 7,470.87

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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.