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Finding the Fourth Proportional to 1,244.51, 1,866.86 and 422.45

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Solution

The fourth proportional to 1,244.51, 1,866.86 and 422.45 is: 633.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,244.51 : 1,866.86 = 422.45 : x
  2. Step 2: Convert to fraction form
    1,244.51/1,866.86 = 422.45/x
  3. Step 3: Cross multiply
    1,244.51x = 1,866.86 × 422.45
  4. Step 4: Simplify right side
    1,244.51x = 788,652.89
  5. Step 5: Solve for x
    x = 788,652.89/1,244.51
  6. Step 6: Final answer
    x = 633.71

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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.