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Finding the Fourth Proportional to 981.88, 1,354.26 and 886.84

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Solution

The fourth proportional to 981.88, 1,354.26 and 886.84 is: 1,223.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.88 : 1,354.26 = 886.84 : x
  2. Step 2: Convert to fraction form
    981.88/1,354.26 = 886.84/x
  3. Step 3: Cross multiply
    981.88x = 1,354.26 × 886.84
  4. Step 4: Simplify right side
    981.88x = 1,201,011.94
  5. Step 5: Solve for x
    x = 1,201,011.94/981.88
  6. Step 6: Final answer
    x = 1,223.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.