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Finding the Fourth Proportional to 715.32, 991.77 and 691.32

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Solution

The fourth proportional to 715.32, 991.77 and 691.32 is: 958.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.32 : 991.77 = 691.32 : x
  2. Step 2: Convert to fraction form
    715.32/991.77 = 691.32/x
  3. Step 3: Cross multiply
    715.32x = 991.77 × 691.32
  4. Step 4: Simplify right side
    715.32x = 685,630.44
  5. Step 5: Solve for x
    x = 685,630.44/715.32
  6. Step 6: Final answer
    x = 958.49

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.