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Finding the Fourth Proportional to 860.70, 1,291.05 and 244.40

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Solution

The fourth proportional to 860.70, 1,291.05 and 244.40 is: 366.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.70 : 1,291.05 = 244.40 : x
  2. Step 2: Convert to fraction form
    860.70/1,291.05 = 244.40/x
  3. Step 3: Cross multiply
    860.70x = 1,291.05 × 244.40
  4. Step 4: Simplify right side
    860.70x = 315,539.22
  5. Step 5: Solve for x
    x = 315,539.22/860.70
  6. Step 6: Final answer
    x = 366.61

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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.