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Finding the Fourth Proportional to 7,320.81, 10,985.13 and 3,425.25

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Solution

The fourth proportional to 7,320.81, 10,985.13 and 3,425.25 is: 5,139.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,320.81 : 10,985.13 = 3,425.25 : x
  2. Step 2: Convert to fraction form
    7,320.81/10,985.13 = 3,425.25/x
  3. Step 3: Cross multiply
    7,320.81x = 10,985.13 × 3,425.25
  4. Step 4: Simplify right side
    7,320.81x = 37,626,816.53
  5. Step 5: Solve for x
    x = 37,626,816.53/7,320.81
  6. Step 6: Final answer
    x = 5,139.71

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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.