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Finding the Fourth Proportional to 674.46, 1,012.12 and 431.16

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Solution

The fourth proportional to 674.46, 1,012.12 and 431.16 is: 647.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.46 : 1,012.12 = 431.16 : x
  2. Step 2: Convert to fraction form
    674.46/1,012.12 = 431.16/x
  3. Step 3: Cross multiply
    674.46x = 1,012.12 × 431.16
  4. Step 4: Simplify right side
    674.46x = 436,385.66
  5. Step 5: Solve for x
    x = 436,385.66/674.46
  6. Step 6: Final answer
    x = 647.01

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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.