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Finding the Fourth Proportional to 1,246.64, 1,720.16 and 748.96

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Solution

The fourth proportional to 1,246.64, 1,720.16 and 748.96 is: 1,033.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.64 : 1,720.16 = 748.96 : x
  2. Step 2: Convert to fraction form
    1,246.64/1,720.16 = 748.96/x
  3. Step 3: Cross multiply
    1,246.64x = 1,720.16 × 748.96
  4. Step 4: Simplify right side
    1,246.64x = 1,288,331.03
  5. Step 5: Solve for x
    x = 1,288,331.03/1,246.64
  6. Step 6: Final answer
    x = 1,033.44

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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.