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Finding the Fourth Proportional to 1,246.19, 1,719.76 and 686.65

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Solution

The fourth proportional to 1,246.19, 1,719.76 and 686.65 is: 947.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.19 : 1,719.76 = 686.65 : x
  2. Step 2: Convert to fraction form
    1,246.19/1,719.76 = 686.65/x
  3. Step 3: Cross multiply
    1,246.19x = 1,719.76 × 686.65
  4. Step 4: Simplify right side
    1,246.19x = 1,180,873.20
  5. Step 5: Solve for x
    x = 1,180,873.20/1,246.19
  6. Step 6: Final answer
    x = 947.59

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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.