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Finding the Fourth Proportional to 912.15, 1,366.20 and 478.80

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Solution

The fourth proportional to 912.15, 1,366.20 and 478.80 is: 717.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.15 : 1,366.20 = 478.80 : x
  2. Step 2: Convert to fraction form
    912.15/1,366.20 = 478.80/x
  3. Step 3: Cross multiply
    912.15x = 1,366.20 × 478.80
  4. Step 4: Simplify right side
    912.15x = 654,136.56
  5. Step 5: Solve for x
    x = 654,136.56/912.15
  6. Step 6: Final answer
    x = 717.14

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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.