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Finding the Fourth Proportional to 947.28, 1,306.08 and 685.20

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Solution

The fourth proportional to 947.28, 1,306.08 and 685.20 is: 944.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.28 : 1,306.08 = 685.20 : x
  2. Step 2: Convert to fraction form
    947.28/1,306.08 = 685.20/x
  3. Step 3: Cross multiply
    947.28x = 1,306.08 × 685.20
  4. Step 4: Simplify right side
    947.28x = 894,926.02
  5. Step 5: Solve for x
    x = 894,926.02/947.28
  6. Step 6: Final answer
    x = 944.73

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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.