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Finding the Fourth Proportional to 860.28, 1,290.42 and 667.50

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Solution

The fourth proportional to 860.28, 1,290.42 and 667.50 is: 1,001.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.28 : 1,290.42 = 667.50 : x
  2. Step 2: Convert to fraction form
    860.28/1,290.42 = 667.50/x
  3. Step 3: Cross multiply
    860.28x = 1,290.42 × 667.50
  4. Step 4: Simplify right side
    860.28x = 861,355.35
  5. Step 5: Solve for x
    x = 861,355.35/860.28
  6. Step 6: Final answer
    x = 1,001.25

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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.