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Finding the Fourth Proportional to 7,229.95, 9,978.47 and 5,239.78

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Solution

The fourth proportional to 7,229.95, 9,978.47 and 5,239.78 is: 7,231.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,229.95 : 9,978.47 = 5,239.78 : x
  2. Step 2: Convert to fraction form
    7,229.95/9,978.47 = 5,239.78/x
  3. Step 3: Cross multiply
    7,229.95x = 9,978.47 × 5,239.78
  4. Step 4: Simplify right side
    7,229.95x = 52,284,987.54
  5. Step 5: Solve for x
    x = 52,284,987.54/7,229.95
  6. Step 6: Final answer
    x = 7,231.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.