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Finding the Fourth Proportional to 6,624.58, 9,121.89 and 6,478.78

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Solution

The fourth proportional to 6,624.58, 9,121.89 and 6,478.78 is: 8,921.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,624.58 : 9,121.89 = 6,478.78 : x
  2. Step 2: Convert to fraction form
    6,624.58/9,121.89 = 6,478.78/x
  3. Step 3: Cross multiply
    6,624.58x = 9,121.89 × 6,478.78
  4. Step 4: Simplify right side
    6,624.58x = 59,098,718.49
  5. Step 5: Solve for x
    x = 59,098,718.49/6,624.58
  6. Step 6: Final answer
    x = 8,921.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.