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Finding the Fourth Proportional to 9,913.79, 14,869.31 and 5,479.65

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Solution

The fourth proportional to 9,913.79, 14,869.31 and 5,479.65 is: 8,218.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,913.79 : 14,869.31 = 5,479.65 : x
  2. Step 2: Convert to fraction form
    9,913.79/14,869.31 = 5,479.65/x
  3. Step 3: Cross multiply
    9,913.79x = 14,869.31 × 5,479.65
  4. Step 4: Simplify right side
    9,913.79x = 81,478,614.54
  5. Step 5: Solve for x
    x = 81,478,614.54/9,913.79
  6. Step 6: Final answer
    x = 8,218.71

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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.