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Finding the Fourth Proportional to 1,866.24, 2,799.84 and 840

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Solution

The fourth proportional to 1,866.24, 2,799.84 and 840 is: 1,260.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,866.24 : 2,799.84 = 840 : x
  2. Step 2: Convert to fraction form
    1,866.24/2,799.84 = 840/x
  3. Step 3: Cross multiply
    1,866.24x = 2,799.84 × 840
  4. Step 4: Simplify right side
    1,866.24x = 2,351,865.60
  5. Step 5: Solve for x
    x = 2,351,865.60/1,866.24
  6. Step 6: Final answer
    x = 1,260.22

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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.