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Finding the Fourth Proportional to 691.92, 948.08 and 685.52

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Solution

The fourth proportional to 691.92, 948.08 and 685.52 is: 939.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.92 : 948.08 = 685.52 : x
  2. Step 2: Convert to fraction form
    691.92/948.08 = 685.52/x
  3. Step 3: Cross multiply
    691.92x = 948.08 × 685.52
  4. Step 4: Simplify right side
    691.92x = 649,927.80
  5. Step 5: Solve for x
    x = 649,927.80/691.92
  6. Step 6: Final answer
    x = 939.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.