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Finding the Fourth Proportional to 1,870, 2,805.20 and 699.82

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Solution

The fourth proportional to 1,870, 2,805.20 and 699.82 is: 1,049.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,870 : 2,805.20 = 699.82 : x
  2. Step 2: Convert to fraction form
    1,870/2,805.20 = 699.82/x
  3. Step 3: Cross multiply
    1,870x = 2,805.20 × 699.82
  4. Step 4: Simplify right side
    1,870x = 1,963,135.06
  5. Step 5: Solve for x
    x = 1,963,135.06/1,870
  6. Step 6: Final answer
    x = 1,049.80

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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.