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Finding the Fourth Proportional to 717.96, 1,077.18 and 393.15

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Solution

The fourth proportional to 717.96, 1,077.18 and 393.15 is: 589.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.96 : 1,077.18 = 393.15 : x
  2. Step 2: Convert to fraction form
    717.96/1,077.18 = 393.15/x
  3. Step 3: Cross multiply
    717.96x = 1,077.18 × 393.15
  4. Step 4: Simplify right side
    717.96x = 423,493.32
  5. Step 5: Solve for x
    x = 423,493.32/717.96
  6. Step 6: Final answer
    x = 589.86

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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.