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Finding the Fourth Proportional to 712.22, 1,070.76 and 658.76

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Solution

The fourth proportional to 712.22, 1,070.76 and 658.76 is: 990.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.22 : 1,070.76 = 658.76 : x
  2. Step 2: Convert to fraction form
    712.22/1,070.76 = 658.76/x
  3. Step 3: Cross multiply
    712.22x = 1,070.76 × 658.76
  4. Step 4: Simplify right side
    712.22x = 705,373.86
  5. Step 5: Solve for x
    x = 705,373.86/712.22
  6. Step 6: Final answer
    x = 990.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.