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Finding the Fourth Proportional to 1,380.38, 2,071.10 and 611.42

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Solution

The fourth proportional to 1,380.38, 2,071.10 and 611.42 is: 917.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.38 : 2,071.10 = 611.42 : x
  2. Step 2: Convert to fraction form
    1,380.38/2,071.10 = 611.42/x
  3. Step 3: Cross multiply
    1,380.38x = 2,071.10 × 611.42
  4. Step 4: Simplify right side
    1,380.38x = 1,266,303.14
  5. Step 5: Solve for x
    x = 1,266,303.14/1,380.38
  6. Step 6: Final answer
    x = 917.36

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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.