Home / 7,129.57-9,839.10-3,985.75

Finding the Fourth Proportional to 7,129.57, 9,839.10 and 3,985.75

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Solution

The fourth proportional to 7,129.57, 9,839.10 and 3,985.75 is: 5,500.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.57 : 9,839.10 = 3,985.75 : x
  2. Step 2: Convert to fraction form
    7,129.57/9,839.10 = 3,985.75/x
  3. Step 3: Cross multiply
    7,129.57x = 9,839.10 × 3,985.75
  4. Step 4: Simplify right side
    7,129.57x = 39,216,192.83
  5. Step 5: Solve for x
    x = 39,216,192.83/7,129.57
  6. Step 6: Final answer
    x = 5,500.50

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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.