Home / 1,397.71-2,098.61-1,278.79

Finding the Fourth Proportional to 1,397.71, 2,098.61 and 1,278.79

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Solution

The fourth proportional to 1,397.71, 2,098.61 and 1,278.79 is: 1,920.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.71 : 2,098.61 = 1,278.79 : x
  2. Step 2: Convert to fraction form
    1,397.71/2,098.61 = 1,278.79/x
  3. Step 3: Cross multiply
    1,397.71x = 2,098.61 × 1,278.79
  4. Step 4: Simplify right side
    1,397.71x = 2,683,674.64
  5. Step 5: Solve for x
    x = 2,683,674.64/1,397.71
  6. Step 6: Final answer
    x = 1,920.06

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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.