Home / 1,398.30-1,929.66-768.88

Finding the Fourth Proportional to 1,398.30, 1,929.66 and 768.88

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Solution

The fourth proportional to 1,398.30, 1,929.66 and 768.88 is: 1,061.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.30 : 1,929.66 = 768.88 : x
  2. Step 2: Convert to fraction form
    1,398.30/1,929.66 = 768.88/x
  3. Step 3: Cross multiply
    1,398.30x = 1,929.66 × 768.88
  4. Step 4: Simplify right side
    1,398.30x = 1,483,676.98
  5. Step 5: Solve for x
    x = 1,483,676.98/1,398.30
  6. Step 6: Final answer
    x = 1,061.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.