Home / 1,398.30-2,097.90-667.79

Finding the Fourth Proportional to 1,398.30, 2,097.90 and 667.79

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Solution

The fourth proportional to 1,398.30, 2,097.90 and 667.79 is: 1,001.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.30 : 2,097.90 = 667.79 : x
  2. Step 2: Convert to fraction form
    1,398.30/2,097.90 = 667.79/x
  3. Step 3: Cross multiply
    1,398.30x = 2,097.90 × 667.79
  4. Step 4: Simplify right side
    1,398.30x = 1,400,946.15
  5. Step 5: Solve for x
    x = 1,400,946.15/1,398.30
  6. Step 6: Final answer
    x = 1,001.89

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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.