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Finding the Fourth Proportional to 917.92, 1,377.05 and 397.82

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Solution

The fourth proportional to 917.92, 1,377.05 and 397.82 is: 596.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.92 : 1,377.05 = 397.82 : x
  2. Step 2: Convert to fraction form
    917.92/1,377.05 = 397.82/x
  3. Step 3: Cross multiply
    917.92x = 1,377.05 × 397.82
  4. Step 4: Simplify right side
    917.92x = 547,823.66
  5. Step 5: Solve for x
    x = 547,823.66/917.92
  6. Step 6: Final answer
    x = 596.81

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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.