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Finding the Fourth Proportional to 860.93, 1,291.39 and 211.66

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Solution

The fourth proportional to 860.93, 1,291.39 and 211.66 is: 317.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.93 : 1,291.39 = 211.66 : x
  2. Step 2: Convert to fraction form
    860.93/1,291.39 = 211.66/x
  3. Step 3: Cross multiply
    860.93x = 1,291.39 × 211.66
  4. Step 4: Simplify right side
    860.93x = 273,335.61
  5. Step 5: Solve for x
    x = 273,335.61/860.93
  6. Step 6: Final answer
    x = 317.49

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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.