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Finding the Fourth Proportional to 2,425.30, 3,638.19 and 781.45

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Solution

The fourth proportional to 2,425.30, 3,638.19 and 781.45 is: 1,172.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,425.30 : 3,638.19 = 781.45 : x
  2. Step 2: Convert to fraction form
    2,425.30/3,638.19 = 781.45/x
  3. Step 3: Cross multiply
    2,425.30x = 3,638.19 × 781.45
  4. Step 4: Simplify right side
    2,425.30x = 2,843,063.58
  5. Step 5: Solve for x
    x = 2,843,063.58/2,425.30
  6. Step 6: Final answer
    x = 1,172.25

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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.