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Finding the Fourth Proportional to 976.56, 1,466.20 and 931.91

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Solution

The fourth proportional to 976.56, 1,466.20 and 931.91 is: 1,399.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.56 : 1,466.20 = 931.91 : x
  2. Step 2: Convert to fraction form
    976.56/1,466.20 = 931.91/x
  3. Step 3: Cross multiply
    976.56x = 1,466.20 × 931.91
  4. Step 4: Simplify right side
    976.56x = 1,366,360.28
  5. Step 5: Solve for x
    x = 1,366,360.28/976.56
  6. Step 6: Final answer
    x = 1,399.16

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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.