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Finding the Fourth Proportional to 928.99, 1,391.86 and 667.72

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Solution

The fourth proportional to 928.99, 1,391.86 and 667.72 is: 1,000.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.99 : 1,391.86 = 667.72 : x
  2. Step 2: Convert to fraction form
    928.99/1,391.86 = 667.72/x
  3. Step 3: Cross multiply
    928.99x = 1,391.86 × 667.72
  4. Step 4: Simplify right side
    928.99x = 929,372.76
  5. Step 5: Solve for x
    x = 929,372.76/928.99
  6. Step 6: Final answer
    x = 1,000.41

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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.