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Finding the Fourth Proportional to 2,425.62, 3,639.15 and 782.40

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Solution

The fourth proportional to 2,425.62, 3,639.15 and 782.40 is: 1,173.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,425.62 : 3,639.15 = 782.40 : x
  2. Step 2: Convert to fraction form
    2,425.62/3,639.15 = 782.40/x
  3. Step 3: Cross multiply
    2,425.62x = 3,639.15 × 782.40
  4. Step 4: Simplify right side
    2,425.62x = 2,847,270.96
  5. Step 5: Solve for x
    x = 2,847,270.96/2,425.62
  6. Step 6: Final answer
    x = 1,173.83

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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.