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Finding the Fourth Proportional to 921.28, 1,270.44 and 672.16

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Solution

The fourth proportional to 921.28, 1,270.44 and 672.16 is: 926.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.28 : 1,270.44 = 672.16 : x
  2. Step 2: Convert to fraction form
    921.28/1,270.44 = 672.16/x
  3. Step 3: Cross multiply
    921.28x = 1,270.44 × 672.16
  4. Step 4: Simplify right side
    921.28x = 853,938.95
  5. Step 5: Solve for x
    x = 853,938.95/921.28
  6. Step 6: Final answer
    x = 926.90

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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.