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Finding the Fourth Proportional to 912.93, 1,366.95 and 547.21

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Solution

The fourth proportional to 912.93, 1,366.95 and 547.21 is: 819.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.93 : 1,366.95 = 547.21 : x
  2. Step 2: Convert to fraction form
    912.93/1,366.95 = 547.21/x
  3. Step 3: Cross multiply
    912.93x = 1,366.95 × 547.21
  4. Step 4: Simplify right side
    912.93x = 748,008.71
  5. Step 5: Solve for x
    x = 748,008.71/912.93
  6. Step 6: Final answer
    x = 819.35

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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.