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Finding the Fourth Proportional to 1,001.34, 1,381.85 and 559.28

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Solution

The fourth proportional to 1,001.34, 1,381.85 and 559.28 is: 771.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.34 : 1,381.85 = 559.28 : x
  2. Step 2: Convert to fraction form
    1,001.34/1,381.85 = 559.28/x
  3. Step 3: Cross multiply
    1,001.34x = 1,381.85 × 559.28
  4. Step 4: Simplify right side
    1,001.34x = 772,841.07
  5. Step 5: Solve for x
    x = 772,841.07/1,001.34
  6. Step 6: Final answer
    x = 771.81

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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.