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Finding the Fourth Proportional to 1,370.78, 1,891.62 and 749.78

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Solution

The fourth proportional to 1,370.78, 1,891.62 and 749.78 is: 1,034.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.78 : 1,891.62 = 749.78 : x
  2. Step 2: Convert to fraction form
    1,370.78/1,891.62 = 749.78/x
  3. Step 3: Cross multiply
    1,370.78x = 1,891.62 × 749.78
  4. Step 4: Simplify right side
    1,370.78x = 1,418,298.84
  5. Step 5: Solve for x
    x = 1,418,298.84/1,370.78
  6. Step 6: Final answer
    x = 1,034.67

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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.