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Finding the Fourth Proportional to 1,901.80, 2,855.40 and 1,491.40

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Solution

The fourth proportional to 1,901.80, 2,855.40 and 1,491.40 is: 2,239.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,901.80 : 2,855.40 = 1,491.40 : x
  2. Step 2: Convert to fraction form
    1,901.80/2,855.40 = 1,491.40/x
  3. Step 3: Cross multiply
    1,901.80x = 2,855.40 × 1,491.40
  4. Step 4: Simplify right side
    1,901.80x = 4,258,543.56
  5. Step 5: Solve for x
    x = 4,258,543.56/1,901.80
  6. Step 6: Final answer
    x = 2,239.22

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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.