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Finding the Fourth Proportional to 709.39, 972.86 and 679.83

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Solution

The fourth proportional to 709.39, 972.86 and 679.83 is: 932.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.39 : 972.86 = 679.83 : x
  2. Step 2: Convert to fraction form
    709.39/972.86 = 679.83/x
  3. Step 3: Cross multiply
    709.39x = 972.86 × 679.83
  4. Step 4: Simplify right side
    709.39x = 661,376.01
  5. Step 5: Solve for x
    x = 661,376.01/709.39
  6. Step 6: Final answer
    x = 932.32

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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.