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Finding the Fourth Proportional to 1,263.18, 1,743.07 and 931.79

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Solution

The fourth proportional to 1,263.18, 1,743.07 and 931.79 is: 1,285.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.18 : 1,743.07 = 931.79 : x
  2. Step 2: Convert to fraction form
    1,263.18/1,743.07 = 931.79/x
  3. Step 3: Cross multiply
    1,263.18x = 1,743.07 × 931.79
  4. Step 4: Simplify right side
    1,263.18x = 1,624,175.20
  5. Step 5: Solve for x
    x = 1,624,175.20/1,263.18
  6. Step 6: Final answer
    x = 1,285.78

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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.