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Finding the Fourth Proportional to 1,012.18, 1,517.16 and 395.70

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Solution

The fourth proportional to 1,012.18, 1,517.16 and 395.70 is: 593.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.18 : 1,517.16 = 395.70 : x
  2. Step 2: Convert to fraction form
    1,012.18/1,517.16 = 395.70/x
  3. Step 3: Cross multiply
    1,012.18x = 1,517.16 × 395.70
  4. Step 4: Simplify right side
    1,012.18x = 600,340.21
  5. Step 5: Solve for x
    x = 600,340.21/1,012.18
  6. Step 6: Final answer
    x = 593.12

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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.