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Finding the Fourth Proportional to 1,405.80, 2,108.70 and 379.80

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Solution

The fourth proportional to 1,405.80, 2,108.70 and 379.80 is: 569.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.80 : 2,108.70 = 379.80 : x
  2. Step 2: Convert to fraction form
    1,405.80/2,108.70 = 379.80/x
  3. Step 3: Cross multiply
    1,405.80x = 2,108.70 × 379.80
  4. Step 4: Simplify right side
    1,405.80x = 800,882.36
  5. Step 5: Solve for x
    x = 800,882.36/1,405.80
  6. Step 6: Final answer
    x = 569.70

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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.