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Finding the Fourth Proportional to 852.89, 1,279.35 and 487.49

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Solution

The fourth proportional to 852.89, 1,279.35 and 487.49 is: 731.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.89 : 1,279.35 = 487.49 : x
  2. Step 2: Convert to fraction form
    852.89/1,279.35 = 487.49/x
  3. Step 3: Cross multiply
    852.89x = 1,279.35 × 487.49
  4. Step 4: Simplify right side
    852.89x = 623,663.93
  5. Step 5: Solve for x
    x = 623,663.93/852.89
  6. Step 6: Final answer
    x = 731.24

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.