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Finding the Fourth Proportional to 1,339.68, 2,009.96 and 690.88

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Solution

The fourth proportional to 1,339.68, 2,009.96 and 690.88 is: 1,036.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.68 : 2,009.96 = 690.88 : x
  2. Step 2: Convert to fraction form
    1,339.68/2,009.96 = 690.88/x
  3. Step 3: Cross multiply
    1,339.68x = 2,009.96 × 690.88
  4. Step 4: Simplify right side
    1,339.68x = 1,388,641.16
  5. Step 5: Solve for x
    x = 1,388,641.16/1,339.68
  6. Step 6: Final answer
    x = 1,036.55

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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.