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Finding the Fourth Proportional to 918.29, 1,375.20 and 431.48

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Solution

The fourth proportional to 918.29, 1,375.20 and 431.48 is: 646.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.29 : 1,375.20 = 431.48 : x
  2. Step 2: Convert to fraction form
    918.29/1,375.20 = 431.48/x
  3. Step 3: Cross multiply
    918.29x = 1,375.20 × 431.48
  4. Step 4: Simplify right side
    918.29x = 593,364.42
  5. Step 5: Solve for x
    x = 593,364.42/918.29
  6. Step 6: Final answer
    x = 646.17

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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.