Home / 3,121.60-4,681.12-1,172.76

Finding the Fourth Proportional to 3,121.60, 4,681.12 and 1,172.76

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Solution

The fourth proportional to 3,121.60, 4,681.12 and 1,172.76 is: 1,758.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.60 : 4,681.12 = 1,172.76 : x
  2. Step 2: Convert to fraction form
    3,121.60/4,681.12 = 1,172.76/x
  3. Step 3: Cross multiply
    3,121.60x = 4,681.12 × 1,172.76
  4. Step 4: Simplify right side
    3,121.60x = 5,489,830.29
  5. Step 5: Solve for x
    x = 5,489,830.29/3,121.60
  6. Step 6: Final answer
    x = 1,758.66

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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.