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Finding the Fourth Proportional to 929.39, 1,279.53 and 812.88

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Solution

The fourth proportional to 929.39, 1,279.53 and 812.88 is: 1,119.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.39 : 1,279.53 = 812.88 : x
  2. Step 2: Convert to fraction form
    929.39/1,279.53 = 812.88/x
  3. Step 3: Cross multiply
    929.39x = 1,279.53 × 812.88
  4. Step 4: Simplify right side
    929.39x = 1,040,104.35
  5. Step 5: Solve for x
    x = 1,040,104.35/929.39
  6. Step 6: Final answer
    x = 1,119.13

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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.