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Finding the Fourth Proportional to 667.17, 1,000.55 and 393.19

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Solution

The fourth proportional to 667.17, 1,000.55 and 393.19 is: 589.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.17 : 1,000.55 = 393.19 : x
  2. Step 2: Convert to fraction form
    667.17/1,000.55 = 393.19/x
  3. Step 3: Cross multiply
    667.17x = 1,000.55 × 393.19
  4. Step 4: Simplify right side
    667.17x = 393,404.74
  5. Step 5: Solve for x
    x = 393,404.74/667.17
  6. Step 6: Final answer
    x = 589.66

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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.