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Finding the Fourth Proportional to 1,246.40, 1,720.00 and 686.87

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Solution

The fourth proportional to 1,246.40, 1,720.00 and 686.87 is: 947.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.40 : 1,720.00 = 686.87 : x
  2. Step 2: Convert to fraction form
    1,246.40/1,720.00 = 686.87/x
  3. Step 3: Cross multiply
    1,246.40x = 1,720.00 × 686.87
  4. Step 4: Simplify right side
    1,246.40x = 1,181,406.08
  5. Step 5: Solve for x
    x = 1,181,406.08/1,246.40
  6. Step 6: Final answer
    x = 947.86

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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.