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Finding the Fourth Proportional to 1,246.24, 1,719.80 and 686.72

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Solution

The fourth proportional to 1,246.24, 1,719.80 and 686.72 is: 947.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.24 : 1,719.80 = 686.72 : x
  2. Step 2: Convert to fraction form
    1,246.24/1,719.80 = 686.72/x
  3. Step 3: Cross multiply
    1,246.24x = 1,719.80 × 686.72
  4. Step 4: Simplify right side
    1,246.24x = 1,181,021.06
  5. Step 5: Solve for x
    x = 1,181,021.06/1,246.24
  6. Step 6: Final answer
    x = 947.67

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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.