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Finding the Fourth Proportional to 1,790, 2,685.36 and 866.20

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Solution

The fourth proportional to 1,790, 2,685.36 and 866.20 is: 1,299.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,790 : 2,685.36 = 866.20 : x
  2. Step 2: Convert to fraction form
    1,790/2,685.36 = 866.20/x
  3. Step 3: Cross multiply
    1,790x = 2,685.36 × 866.20
  4. Step 4: Simplify right side
    1,790x = 2,326,058.83
  5. Step 5: Solve for x
    x = 2,326,058.83/1,790
  6. Step 6: Final answer
    x = 1,299.47

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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.