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Finding the Fourth Proportional to 3,087.72, 4,631.56 and 779.22

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Solution

The fourth proportional to 3,087.72, 4,631.56 and 779.22 is: 1,168.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,087.72 : 4,631.56 = 779.22 : x
  2. Step 2: Convert to fraction form
    3,087.72/4,631.56 = 779.22/x
  3. Step 3: Cross multiply
    3,087.72x = 4,631.56 × 779.22
  4. Step 4: Simplify right side
    3,087.72x = 3,609,002.24
  5. Step 5: Solve for x
    x = 3,609,002.24/3,087.72
  6. Step 6: Final answer
    x = 1,168.82

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1.5x scale

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.