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Finding the Fourth Proportional to 2,071.20, 3,106.80 and 772.52

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Solution

The fourth proportional to 2,071.20, 3,106.80 and 772.52 is: 1,158.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,071.20 : 3,106.80 = 772.52 : x
  2. Step 2: Convert to fraction form
    2,071.20/3,106.80 = 772.52/x
  3. Step 3: Cross multiply
    2,071.20x = 3,106.80 × 772.52
  4. Step 4: Simplify right side
    2,071.20x = 2,400,065.14
  5. Step 5: Solve for x
    x = 2,400,065.14/2,071.20
  6. Step 6: Final answer
    x = 1,158.78

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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.