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Finding the Fourth Proportional to 1,001.28, 1,381.53 and 608.28

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Solution

The fourth proportional to 1,001.28, 1,381.53 and 608.28 is: 839.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.28 : 1,381.53 = 608.28 : x
  2. Step 2: Convert to fraction form
    1,001.28/1,381.53 = 608.28/x
  3. Step 3: Cross multiply
    1,001.28x = 1,381.53 × 608.28
  4. Step 4: Simplify right side
    1,001.28x = 840,357.07
  5. Step 5: Solve for x
    x = 840,357.07/1,001.28
  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.