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Finding the Fourth Proportional to 1,122.66, 1,679.88 and 660.66

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Solution

The fourth proportional to 1,122.66, 1,679.88 and 660.66 is: 988.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.66 : 1,679.88 = 660.66 : x
  2. Step 2: Convert to fraction form
    1,122.66/1,679.88 = 660.66/x
  3. Step 3: Cross multiply
    1,122.66x = 1,679.88 × 660.66
  4. Step 4: Simplify right side
    1,122.66x = 1,109,829.52
  5. Step 5: Solve for x
    x = 1,109,829.52/1,122.66
  6. Step 6: Final answer
    x = 988.57

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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.