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Finding the Fourth Proportional to 1,646.80, 2,469.30 and 781.18

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Solution

The fourth proportional to 1,646.80, 2,469.30 and 781.18 is: 1,171.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,646.80 : 2,469.30 = 781.18 : x
  2. Step 2: Convert to fraction form
    1,646.80/2,469.30 = 781.18/x
  3. Step 3: Cross multiply
    1,646.80x = 2,469.30 × 781.18
  4. Step 4: Simplify right side
    1,646.80x = 1,928,967.77
  5. Step 5: Solve for x
    x = 1,928,967.77/1,646.80
  6. Step 6: Final answer
    x = 1,171.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.