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Finding the Fourth Proportional to 981.20, 1,354 and 608.20

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Solution

The fourth proportional to 981.20, 1,354 and 608.20 is: 839.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.20 : 1,354 = 608.20 : x
  2. Step 2: Convert to fraction form
    981.20/1,354 = 608.20/x
  3. Step 3: Cross multiply
    981.20x = 1,354 × 608.20
  4. Step 4: Simplify right side
    981.20x = 823,502.80
  5. Step 5: Solve for x
    x = 823,502.80/981.20
  6. Step 6: Final answer
    x = 839.28

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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.