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Finding the Fourth Proportional to 918.56, 1,377.43 and 431.35

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Solution

The fourth proportional to 918.56, 1,377.43 and 431.35 is: 646.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.56 : 1,377.43 = 431.35 : x
  2. Step 2: Convert to fraction form
    918.56/1,377.43 = 431.35/x
  3. Step 3: Cross multiply
    918.56x = 1,377.43 × 431.35
  4. Step 4: Simplify right side
    918.56x = 594,154.43
  5. Step 5: Solve for x
    x = 594,154.43/918.56
  6. Step 6: Final answer
    x = 646.83

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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.