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Finding the Fourth Proportional to 918.32, 1,377.96 and 431.30

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Solution

The fourth proportional to 918.32, 1,377.96 and 431.30 is: 647.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.32 : 1,377.96 = 431.30 : x
  2. Step 2: Convert to fraction form
    918.32/1,377.96 = 431.30/x
  3. Step 3: Cross multiply
    918.32x = 1,377.96 × 431.30
  4. Step 4: Simplify right side
    918.32x = 594,314.15
  5. Step 5: Solve for x
    x = 594,314.15/918.32
  6. Step 6: Final answer
    x = 647.18

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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.