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Finding the Fourth Proportional to 860.38, 1,291.06 and 427.54

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Solution

The fourth proportional to 860.38, 1,291.06 and 427.54 is: 641.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.38 : 1,291.06 = 427.54 : x
  2. Step 2: Convert to fraction form
    860.38/1,291.06 = 427.54/x
  3. Step 3: Cross multiply
    860.38x = 1,291.06 × 427.54
  4. Step 4: Simplify right side
    860.38x = 551,979.79
  5. Step 5: Solve for x
    x = 551,979.79/860.38
  6. Step 6: Final answer
    x = 641.55

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Double scale
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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.