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Finding the Fourth Proportional to 2,538.43, 3,807.65 and 783.43

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Solution

The fourth proportional to 2,538.43, 3,807.65 and 783.43 is: 1,175.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,538.43 : 3,807.65 = 783.43 : x
  2. Step 2: Convert to fraction form
    2,538.43/3,807.65 = 783.43/x
  3. Step 3: Cross multiply
    2,538.43x = 3,807.65 × 783.43
  4. Step 4: Simplify right side
    2,538.43x = 2,983,019.68
  5. Step 5: Solve for x
    x = 2,983,019.68/2,538.43
  6. Step 6: Final answer
    x = 1,175.14

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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.