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Finding the Fourth Proportional to 3,172.13, 4,757.74 and 980.88

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Solution

The fourth proportional to 3,172.13, 4,757.74 and 980.88 is: 1,471.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,172.13 : 4,757.74 = 980.88 : x
  2. Step 2: Convert to fraction form
    3,172.13/4,757.74 = 980.88/x
  3. Step 3: Cross multiply
    3,172.13x = 4,757.74 × 980.88
  4. Step 4: Simplify right side
    3,172.13x = 4,666,751.72
  5. Step 5: Solve for x
    x = 4,666,751.72/3,172.13
  6. Step 6: Final answer
    x = 1,471.17

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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.