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Finding the Fourth Proportional to 1,008.42, 1,513.17 and 431.34

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Solution

The fourth proportional to 1,008.42, 1,513.17 and 431.34 is: 647.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.42 : 1,513.17 = 431.34 : x
  2. Step 2: Convert to fraction form
    1,008.42/1,513.17 = 431.34/x
  3. Step 3: Cross multiply
    1,008.42x = 1,513.17 × 431.34
  4. Step 4: Simplify right side
    1,008.42x = 652,690.75
  5. Step 5: Solve for x
    x = 652,690.75/1,008.42
  6. Step 6: Final answer
    x = 647.24

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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.