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Finding the Fourth Proportional to 670.59, 1,005.21 and 381.42

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Solution

The fourth proportional to 670.59, 1,005.21 and 381.42 is: 571.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.59 : 1,005.21 = 381.42 : x
  2. Step 2: Convert to fraction form
    670.59/1,005.21 = 381.42/x
  3. Step 3: Cross multiply
    670.59x = 1,005.21 × 381.42
  4. Step 4: Simplify right side
    670.59x = 383,407.20
  5. Step 5: Solve for x
    x = 383,407.20/670.59
  6. Step 6: Final answer
    x = 571.75

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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.