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Finding the Fourth Proportional to 1,278.67, 1,764.67 and 740.49

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Solution

The fourth proportional to 1,278.67, 1,764.67 and 740.49 is: 1,021.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.67 : 1,764.67 = 740.49 : x
  2. Step 2: Convert to fraction form
    1,278.67/1,764.67 = 740.49/x
  3. Step 3: Cross multiply
    1,278.67x = 1,764.67 × 740.49
  4. Step 4: Simplify right side
    1,278.67x = 1,306,726.46
  5. Step 5: Solve for x
    x = 1,306,726.46/1,278.67
  6. Step 6: Final answer
    x = 1,021.94

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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.