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Finding the Fourth Proportional to 860.28, 1,290.06 and 275.12

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Solution

The fourth proportional to 860.28, 1,290.06 and 275.12 is: 412.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.28 : 1,290.06 = 275.12 : x
  2. Step 2: Convert to fraction form
    860.28/1,290.06 = 275.12/x
  3. Step 3: Cross multiply
    860.28x = 1,290.06 × 275.12
  4. Step 4: Simplify right side
    860.28x = 354,921.31
  5. Step 5: Solve for x
    x = 354,921.31/860.28
  6. Step 6: Final answer
    x = 412.56

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Double scale
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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.