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Finding the Fourth Proportional to 1,008.18, 1,512.34 and 642.46

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Solution

The fourth proportional to 1,008.18, 1,512.34 and 642.46 is: 963.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.18 : 1,512.34 = 642.46 : x
  2. Step 2: Convert to fraction form
    1,008.18/1,512.34 = 642.46/x
  3. Step 3: Cross multiply
    1,008.18x = 1,512.34 × 642.46
  4. Step 4: Simplify right side
    1,008.18x = 971,617.96
  5. Step 5: Solve for x
    x = 971,617.96/1,008.18
  6. Step 6: Final answer
    x = 963.73

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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.