Home / 7,172.28-9,897.40-3,985.78

Finding the Fourth Proportional to 7,172.28, 9,897.40 and 3,985.78

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Solution

The fourth proportional to 7,172.28, 9,897.40 and 3,985.78 is: 5,500.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,172.28 : 9,897.40 = 3,985.78 : x
  2. Step 2: Convert to fraction form
    7,172.28/9,897.40 = 3,985.78/x
  3. Step 3: Cross multiply
    7,172.28x = 9,897.40 × 3,985.78
  4. Step 4: Simplify right side
    7,172.28x = 39,448,858.97
  5. Step 5: Solve for x
    x = 39,448,858.97/7,172.28
  6. Step 6: Final answer
    x = 5,500.18

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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.