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Finding the Fourth Proportional to 928.64, 1,391.49 and 754.46

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Solution

The fourth proportional to 928.64, 1,391.49 and 754.46 is: 1,130.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.64 : 1,391.49 = 754.46 : x
  2. Step 2: Convert to fraction form
    928.64/1,391.49 = 754.46/x
  3. Step 3: Cross multiply
    928.64x = 1,391.49 × 754.46
  4. Step 4: Simplify right side
    928.64x = 1,049,823.55
  5. Step 5: Solve for x
    x = 1,049,823.55/928.64
  6. Step 6: Final answer
    x = 1,130.50

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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.