Home / 1,451.20-2,172.68-931.78

Finding the Fourth Proportional to 1,451.20, 2,172.68 and 931.78

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Solution

The fourth proportional to 1,451.20, 2,172.68 and 931.78 is: 1,395.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,451.20 : 2,172.68 = 931.78 : x
  2. Step 2: Convert to fraction form
    1,451.20/2,172.68 = 931.78/x
  3. Step 3: Cross multiply
    1,451.20x = 2,172.68 × 931.78
  4. Step 4: Simplify right side
    1,451.20x = 2,024,459.77
  5. Step 5: Solve for x
    x = 2,024,459.77/1,451.20
  6. Step 6: Final answer
    x = 1,395.02

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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.