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Finding the Fourth Proportional to 974.35, 1,344.36 and 931.83

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Solution

The fourth proportional to 974.35, 1,344.36 and 931.83 is: 1,285.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.35 : 1,344.36 = 931.83 : x
  2. Step 2: Convert to fraction form
    974.35/1,344.36 = 931.83/x
  3. Step 3: Cross multiply
    974.35x = 1,344.36 × 931.83
  4. Step 4: Simplify right side
    974.35x = 1,252,714.98
  5. Step 5: Solve for x
    x = 1,252,714.98/974.35
  6. Step 6: Final answer
    x = 1,285.69

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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.