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Finding the Fourth Proportional to 996.32, 1,487.32 and 931.04

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Solution

The fourth proportional to 996.32, 1,487.32 and 931.04 is: 1,389.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.32 : 1,487.32 = 931.04 : x
  2. Step 2: Convert to fraction form
    996.32/1,487.32 = 931.04/x
  3. Step 3: Cross multiply
    996.32x = 1,487.32 × 931.04
  4. Step 4: Simplify right side
    996.32x = 1,384,754.41
  5. Step 5: Solve for x
    x = 1,384,754.41/996.32
  6. Step 6: Final answer
    x = 1,389.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.