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Finding the Fourth Proportional to 1,380.94, 2,071.25 and 491.35

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Solution

The fourth proportional to 1,380.94, 2,071.25 and 491.35 is: 736.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.94 : 2,071.25 = 491.35 : x
  2. Step 2: Convert to fraction form
    1,380.94/2,071.25 = 491.35/x
  3. Step 3: Cross multiply
    1,380.94x = 2,071.25 × 491.35
  4. Step 4: Simplify right side
    1,380.94x = 1,017,708.69
  5. Step 5: Solve for x
    x = 1,017,708.69/1,380.94
  6. Step 6: Final answer
    x = 736.97

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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.