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Finding the Fourth Proportional to 1,245.64, 1,718.92 and 686.10

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Solution

The fourth proportional to 1,245.64, 1,718.92 and 686.10 is: 946.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.64 : 1,718.92 = 686.10 : x
  2. Step 2: Convert to fraction form
    1,245.64/1,718.92 = 686.10/x
  3. Step 3: Cross multiply
    1,245.64x = 1,718.92 × 686.10
  4. Step 4: Simplify right side
    1,245.64x = 1,179,347.44
  5. Step 5: Solve for x
    x = 1,179,347.44/1,245.64
  6. Step 6: Final answer
    x = 946.78

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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.