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Finding the Fourth Proportional to 9,912.79, 14,867.81 and 5,478.65

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Solution

The fourth proportional to 9,912.79, 14,867.81 and 5,478.65 is: 8,217.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,912.79 : 14,867.81 = 5,478.65 : x
  2. Step 2: Convert to fraction form
    9,912.79/14,867.81 = 5,478.65/x
  3. Step 3: Cross multiply
    9,912.79x = 14,867.81 × 5,478.65
  4. Step 4: Simplify right side
    9,912.79x = 81,455,503.78
  5. Step 5: Solve for x
    x = 81,455,503.78/9,912.79
  6. Step 6: Final answer
    x = 8,217.21

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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.