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Finding the Fourth Proportional to 928.48, 1,279.64 and 679.40

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Solution

The fourth proportional to 928.48, 1,279.64 and 679.40 is: 936.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.48 : 1,279.64 = 679.40 : x
  2. Step 2: Convert to fraction form
    928.48/1,279.64 = 679.40/x
  3. Step 3: Cross multiply
    928.48x = 1,279.64 × 679.40
  4. Step 4: Simplify right side
    928.48x = 869,387.42
  5. Step 5: Solve for x
    x = 869,387.42/928.48
  6. Step 6: Final answer
    x = 936.36

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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.