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Finding the Fourth Proportional to 860.27, 1,187.15 and 528.68

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Solution

The fourth proportional to 860.27, 1,187.15 and 528.68 is: 729.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.27 : 1,187.15 = 528.68 : x
  2. Step 2: Convert to fraction form
    860.27/1,187.15 = 528.68/x
  3. Step 3: Cross multiply
    860.27x = 1,187.15 × 528.68
  4. Step 4: Simplify right side
    860.27x = 627,622.79
  5. Step 5: Solve for x
    x = 627,622.79/860.27
  6. Step 6: Final answer
    x = 729.57

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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.