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Finding the Fourth Proportional to 865.47, 1,194.20 and 492.39

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Solution

The fourth proportional to 865.47, 1,194.20 and 492.39 is: 679.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.47 : 1,194.20 = 492.39 : x
  2. Step 2: Convert to fraction form
    865.47/1,194.20 = 492.39/x
  3. Step 3: Cross multiply
    865.47x = 1,194.20 × 492.39
  4. Step 4: Simplify right side
    865.47x = 588,009.68
  5. Step 5: Solve for x
    x = 588,009.68/865.47
  6. Step 6: Final answer
    x = 679.41

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Half scale
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Double scale
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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.