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Finding the Fourth Proportional to 976.80, 1,346.40 and 763.74

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Solution

The fourth proportional to 976.80, 1,346.40 and 763.74 is: 1,052.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.80 : 1,346.40 = 763.74 : x
  2. Step 2: Convert to fraction form
    976.80/1,346.40 = 763.74/x
  3. Step 3: Cross multiply
    976.80x = 1,346.40 × 763.74
  4. Step 4: Simplify right side
    976.80x = 1,028,299.54
  5. Step 5: Solve for x
    x = 1,028,299.54/976.80
  6. Step 6: Final answer
    x = 1,052.72

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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.