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Finding the Fourth Proportional to 1,008.43, 1,512.16 and 661.75

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Solution

The fourth proportional to 1,008.43, 1,512.16 and 661.75 is: 992.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.43 : 1,512.16 = 661.75 : x
  2. Step 2: Convert to fraction form
    1,008.43/1,512.16 = 661.75/x
  3. Step 3: Cross multiply
    1,008.43x = 1,512.16 × 661.75
  4. Step 4: Simplify right side
    1,008.43x = 1,000,671.88
  5. Step 5: Solve for x
    x = 1,000,671.88/1,008.43
  6. Step 6: Final answer
    x = 992.31

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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.