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Finding the Fourth Proportional to 1,008.50, 1,513.38 and 431.38

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Solution

The fourth proportional to 1,008.50, 1,513.38 and 431.38 is: 647.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.50 : 1,513.38 = 431.38 : x
  2. Step 2: Convert to fraction form
    1,008.50/1,513.38 = 431.38/x
  3. Step 3: Cross multiply
    1,008.50x = 1,513.38 × 431.38
  4. Step 4: Simplify right side
    1,008.50x = 652,834.30
  5. Step 5: Solve for x
    x = 652,834.30/1,008.50
  6. Step 6: Final answer
    x = 647.33

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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.