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Finding the Fourth Proportional to 5,085.68, 7,620.68 and 2,490.40

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Solution

The fourth proportional to 5,085.68, 7,620.68 and 2,490.40 is: 3,731.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,085.68 : 7,620.68 = 2,490.40 : x
  2. Step 2: Convert to fraction form
    5,085.68/7,620.68 = 2,490.40/x
  3. Step 3: Cross multiply
    5,085.68x = 7,620.68 × 2,490.40
  4. Step 4: Simplify right side
    5,085.68x = 18,978,541.47
  5. Step 5: Solve for x
    x = 18,978,541.47/5,085.68
  6. Step 6: Final answer
    x = 3,731.76

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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.