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Finding the Fourth Proportional to 1,866.20, 2,801.10 and 942.80

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Solution

The fourth proportional to 1,866.20, 2,801.10 and 942.80 is: 1,415.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,866.20 : 2,801.10 = 942.80 : x
  2. Step 2: Convert to fraction form
    1,866.20/2,801.10 = 942.80/x
  3. Step 3: Cross multiply
    1,866.20x = 2,801.10 × 942.80
  4. Step 4: Simplify right side
    1,866.20x = 2,640,877.08
  5. Step 5: Solve for x
    x = 2,640,877.08/1,866.20
  6. Step 6: Final answer
    x = 1,415.11

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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.