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Finding the Fourth Proportional to 1,008.75, 1,512.18 and 918.57

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Solution

The fourth proportional to 1,008.75, 1,512.18 and 918.57 is: 1,376.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.75 : 1,512.18 = 918.57 : x
  2. Step 2: Convert to fraction form
    1,008.75/1,512.18 = 918.57/x
  3. Step 3: Cross multiply
    1,008.75x = 1,512.18 × 918.57
  4. Step 4: Simplify right side
    1,008.75x = 1,389,043.18
  5. Step 5: Solve for x
    x = 1,389,043.18/1,008.75
  6. Step 6: Final answer
    x = 1,376.99

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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.