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Finding the Fourth Proportional to 667.28, 921.12 and 431.30

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Solution

The fourth proportional to 667.28, 921.12 and 431.30 is: 595.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.28 : 921.12 = 431.30 : x
  2. Step 2: Convert to fraction form
    667.28/921.12 = 431.30/x
  3. Step 3: Cross multiply
    667.28x = 921.12 × 431.30
  4. Step 4: Simplify right side
    667.28x = 397,279.06
  5. Step 5: Solve for x
    x = 397,279.06/667.28
  6. Step 6: Final answer
    x = 595.37

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1.5x scale

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.