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Finding the Fourth Proportional to 1,866, 2,799.90 and 712.56

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Solution

The fourth proportional to 1,866, 2,799.90 and 712.56 is: 1,069.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,866 : 2,799.90 = 712.56 : x
  2. Step 2: Convert to fraction form
    1,866/2,799.90 = 712.56/x
  3. Step 3: Cross multiply
    1,866x = 2,799.90 × 712.56
  4. Step 4: Simplify right side
    1,866x = 1,995,096.74
  5. Step 5: Solve for x
    x = 1,995,096.74/1,866
  6. Step 6: Final answer
    x = 1,069.18

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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.