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Finding the Fourth Proportional to 5,118, 7,681.32 and 2,040

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Solution

The fourth proportional to 5,118, 7,681.32 and 2,040 is: 3,061.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,118 : 7,681.32 = 2,040 : x
  2. Step 2: Convert to fraction form
    5,118/7,681.32 = 2,040/x
  3. Step 3: Cross multiply
    5,118x = 7,681.32 × 2,040
  4. Step 4: Simplify right side
    5,118x = 15,669,892.80
  5. Step 5: Solve for x
    x = 15,669,892.80/5,118
  6. Step 6: Final answer
    x = 3,061.72

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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.