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Finding the Fourth Proportional to 976.74, 1,346.60 and 723.86

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Solution

The fourth proportional to 976.74, 1,346.60 and 723.86 is: 997.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.74 : 1,346.60 = 723.86 : x
  2. Step 2: Convert to fraction form
    976.74/1,346.60 = 723.86/x
  3. Step 3: Cross multiply
    976.74x = 1,346.60 × 723.86
  4. Step 4: Simplify right side
    976.74x = 974,739.52
  5. Step 5: Solve for x
    x = 974,739.52/976.74
  6. Step 6: Final answer
    x = 997.95

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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.