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Finding the Fourth Proportional to 917.92, 1,376.64 and 397.92

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Solution

The fourth proportional to 917.92, 1,376.64 and 397.92 is: 596.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.92 : 1,376.64 = 397.92 : x
  2. Step 2: Convert to fraction form
    917.92/1,376.64 = 397.92/x
  3. Step 3: Cross multiply
    917.92x = 1,376.64 × 397.92
  4. Step 4: Simplify right side
    917.92x = 547,792.59
  5. Step 5: Solve for x
    x = 547,792.59/917.92
  6. Step 6: Final answer
    x = 596.78

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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.