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Finding the Fourth Proportional to 1,246.48, 1,720.10 and 686.96

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Solution

The fourth proportional to 1,246.48, 1,720.10 and 686.96 is: 947.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.48 : 1,720.10 = 686.96 : x
  2. Step 2: Convert to fraction form
    1,246.48/1,720.10 = 686.96/x
  3. Step 3: Cross multiply
    1,246.48x = 1,720.10 × 686.96
  4. Step 4: Simplify right side
    1,246.48x = 1,181,639.90
  5. Step 5: Solve for x
    x = 1,181,639.90/1,246.48
  6. Step 6: Final answer
    x = 947.98

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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.