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Finding the Fourth Proportional to 1,347.38, 2,020.74 and 688.82

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Solution

The fourth proportional to 1,347.38, 2,020.74 and 688.82 is: 1,033.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.38 : 2,020.74 = 688.82 : x
  2. Step 2: Convert to fraction form
    1,347.38/2,020.74 = 688.82/x
  3. Step 3: Cross multiply
    1,347.38x = 2,020.74 × 688.82
  4. Step 4: Simplify right side
    1,347.38x = 1,391,926.13
  5. Step 5: Solve for x
    x = 1,391,926.13/1,347.38
  6. Step 6: Final answer
    x = 1,033.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.