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Finding the Fourth Proportional to 921.74, 1,378.82 and 767.88

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Solution

The fourth proportional to 921.74, 1,378.82 and 767.88 is: 1,148.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.74 : 1,378.82 = 767.88 : x
  2. Step 2: Convert to fraction form
    921.74/1,378.82 = 767.88/x
  3. Step 3: Cross multiply
    921.74x = 1,378.82 × 767.88
  4. Step 4: Simplify right side
    921.74x = 1,058,770.22
  5. Step 5: Solve for x
    x = 1,058,770.22/921.74
  6. Step 6: Final answer
    x = 1,148.67

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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.