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Finding the Fourth Proportional to 1,117.70, 1,676.55 and 658.68

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Solution

The fourth proportional to 1,117.70, 1,676.55 and 658.68 is: 988.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.70 : 1,676.55 = 658.68 : x
  2. Step 2: Convert to fraction form
    1,117.70/1,676.55 = 658.68/x
  3. Step 3: Cross multiply
    1,117.70x = 1,676.55 × 658.68
  4. Step 4: Simplify right side
    1,117.70x = 1,104,309.95
  5. Step 5: Solve for x
    x = 1,104,309.95/1,117.70
  6. Step 6: Final answer
    x = 988.02

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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.