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Finding the Fourth Proportional to 667.61, 921.80 and 431.70

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Solution

The fourth proportional to 667.61, 921.80 and 431.70 is: 596.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.61 : 921.80 = 431.70 : x
  2. Step 2: Convert to fraction form
    667.61/921.80 = 431.70/x
  3. Step 3: Cross multiply
    667.61x = 921.80 × 431.70
  4. Step 4: Simplify right side
    667.61x = 397,941.06
  5. Step 5: Solve for x
    x = 397,941.06/667.61
  6. Step 6: Final answer
    x = 596.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.