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Finding the Fourth Proportional to 1,246.39, 1,719.99 and 686.86

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Solution

The fourth proportional to 1,246.39, 1,719.99 and 686.86 is: 947.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.39 : 1,719.99 = 686.86 : x
  2. Step 2: Convert to fraction form
    1,246.39/1,719.99 = 686.86/x
  3. Step 3: Cross multiply
    1,246.39x = 1,719.99 × 686.86
  4. Step 4: Simplify right side
    1,246.39x = 1,181,392.33
  5. Step 5: Solve for x
    x = 1,181,392.33/1,246.39
  6. Step 6: Final answer
    x = 947.85

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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.