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Finding the Fourth Proportional to 1,086.75, 1,630.28 and 356.18

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Solution

The fourth proportional to 1,086.75, 1,630.28 and 356.18 is: 534.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.75 : 1,630.28 = 356.18 : x
  2. Step 2: Convert to fraction form
    1,086.75/1,630.28 = 356.18/x
  3. Step 3: Cross multiply
    1,086.75x = 1,630.28 × 356.18
  4. Step 4: Simplify right side
    1,086.75x = 580,673.13
  5. Step 5: Solve for x
    x = 580,673.13/1,086.75
  6. Step 6: Final answer
    x = 534.32

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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.