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Finding the Fourth Proportional to 918.53, 1,377.99 and 431.31

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Solution

The fourth proportional to 918.53, 1,377.99 and 431.31 is: 647.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.53 : 1,377.99 = 431.31 : x
  2. Step 2: Convert to fraction form
    918.53/1,377.99 = 431.31/x
  3. Step 3: Cross multiply
    918.53x = 1,377.99 × 431.31
  4. Step 4: Simplify right side
    918.53x = 594,338.71
  5. Step 5: Solve for x
    x = 594,338.71/918.53
  6. Step 6: Final answer
    x = 647.06

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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.