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Finding the Fourth Proportional to 918.64, 1,377.65 and 398.31

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Solution

The fourth proportional to 918.64, 1,377.65 and 398.31 is: 597.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.64 : 1,377.65 = 398.31 : x
  2. Step 2: Convert to fraction form
    918.64/1,377.65 = 398.31/x
  3. Step 3: Cross multiply
    918.64x = 1,377.65 × 398.31
  4. Step 4: Simplify right side
    918.64x = 548,732.77
  5. Step 5: Solve for x
    x = 548,732.77/918.64
  6. Step 6: Final answer
    x = 597.33

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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.