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Finding the Fourth Proportional to 928.56, 1,279.88 and 695.28

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Solution

The fourth proportional to 928.56, 1,279.88 and 695.28 is: 958.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.56 : 1,279.88 = 695.28 : x
  2. Step 2: Convert to fraction form
    928.56/1,279.88 = 695.28/x
  3. Step 3: Cross multiply
    928.56x = 1,279.88 × 695.28
  4. Step 4: Simplify right side
    928.56x = 889,874.97
  5. Step 5: Solve for x
    x = 889,874.97/928.56
  6. Step 6: Final answer
    x = 958.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.