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Finding the Fourth Proportional to 1,244.37, 1,866.80 and 422.61

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Solution

The fourth proportional to 1,244.37, 1,866.80 and 422.61 is: 634.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,244.37 : 1,866.80 = 422.61 : x
  2. Step 2: Convert to fraction form
    1,244.37/1,866.80 = 422.61/x
  3. Step 3: Cross multiply
    1,244.37x = 1,866.80 × 422.61
  4. Step 4: Simplify right side
    1,244.37x = 788,929.40
  5. Step 5: Solve for x
    x = 788,929.40/1,244.37
  6. Step 6: Final answer
    x = 634.00

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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.