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Finding the Fourth Proportional to 7,035, 9,708.60 and 3,891.20

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Solution

The fourth proportional to 7,035, 9,708.60 and 3,891.20 is: 5,370.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,035 : 9,708.60 = 3,891.20 : x
  2. Step 2: Convert to fraction form
    7,035/9,708.60 = 3,891.20/x
  3. Step 3: Cross multiply
    7,035x = 9,708.60 × 3,891.20
  4. Step 4: Simplify right side
    7,035x = 37,778,055.78
  5. Step 5: Solve for x
    x = 37,778,055.78/7,035
  6. Step 6: Final answer
    x = 5,370.02

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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.