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Finding the Fourth Proportional to 1,339.07, 2,009.21 and 690.26

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Solution

The fourth proportional to 1,339.07, 2,009.21 and 690.26 is: 1,035.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.07 : 2,009.21 = 690.26 : x
  2. Step 2: Convert to fraction form
    1,339.07/2,009.21 = 690.26/x
  3. Step 3: Cross multiply
    1,339.07x = 2,009.21 × 690.26
  4. Step 4: Simplify right side
    1,339.07x = 1,386,863.80
  5. Step 5: Solve for x
    x = 1,386,863.80/1,339.07
  6. Step 6: Final answer
    x = 1,035.70

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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.