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Finding the Fourth Proportional to 874.42, 1,309.95 and 658.90

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Solution

The fourth proportional to 874.42, 1,309.95 and 658.90 is: 987.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.42 : 1,309.95 = 658.90 : x
  2. Step 2: Convert to fraction form
    874.42/1,309.95 = 658.90/x
  3. Step 3: Cross multiply
    874.42x = 1,309.95 × 658.90
  4. Step 4: Simplify right side
    874.42x = 863,126.06
  5. Step 5: Solve for x
    x = 863,126.06/874.42
  6. Step 6: Final answer
    x = 987.08

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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.