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Finding the Fourth Proportional to 1,041.87, 1,439.82 and 931.15

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Solution

The fourth proportional to 1,041.87, 1,439.82 and 931.15 is: 1,286.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.87 : 1,439.82 = 931.15 : x
  2. Step 2: Convert to fraction form
    1,041.87/1,439.82 = 931.15/x
  3. Step 3: Cross multiply
    1,041.87x = 1,439.82 × 931.15
  4. Step 4: Simplify right side
    1,041.87x = 1,340,688.39
  5. Step 5: Solve for x
    x = 1,340,688.39/1,041.87
  6. Step 6: Final answer
    x = 1,286.81

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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.