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Finding the Fourth Proportional to 711.08, 987.14 and 691.04

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Solution

The fourth proportional to 711.08, 987.14 and 691.04 is: 959.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.08 : 987.14 = 691.04 : x
  2. Step 2: Convert to fraction form
    711.08/987.14 = 691.04/x
  3. Step 3: Cross multiply
    711.08x = 987.14 × 691.04
  4. Step 4: Simplify right side
    711.08x = 682,153.23
  5. Step 5: Solve for x
    x = 682,153.23/711.08
  6. Step 6: Final answer
    x = 959.32

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1.5x scale

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.