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Finding the Fourth Proportional to 974.29, 1,343.74 and 690.21

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Solution

The fourth proportional to 974.29, 1,343.74 and 690.21 is: 951.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.29 : 1,343.74 = 690.21 : x
  2. Step 2: Convert to fraction form
    974.29/1,343.74 = 690.21/x
  3. Step 3: Cross multiply
    974.29x = 1,343.74 × 690.21
  4. Step 4: Simplify right side
    974.29x = 927,462.79
  5. Step 5: Solve for x
    x = 927,462.79/974.29
  6. Step 6: Final answer
    x = 951.94

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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.