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Finding the Fourth Proportional to 1,001.39, 1,381.91 and 559.29

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Solution

The fourth proportional to 1,001.39, 1,381.91 and 559.29 is: 771.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.39 : 1,381.91 = 559.29 : x
  2. Step 2: Convert to fraction form
    1,001.39/1,381.91 = 559.29/x
  3. Step 3: Cross multiply
    1,001.39x = 1,381.91 × 559.29
  4. Step 4: Simplify right side
    1,001.39x = 772,888.44
  5. Step 5: Solve for x
    x = 772,888.44/1,001.39
  6. Step 6: Final answer
    x = 771.82

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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.