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Finding the Fourth Proportional to 1,244.08, 1,866.60 and 422.35

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Solution

The fourth proportional to 1,244.08, 1,866.60 and 422.35 is: 633.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,244.08 : 1,866.60 = 422.35 : x
  2. Step 2: Convert to fraction form
    1,244.08/1,866.60 = 422.35/x
  3. Step 3: Cross multiply
    1,244.08x = 1,866.60 × 422.35
  4. Step 4: Simplify right side
    1,244.08x = 788,358.51
  5. Step 5: Solve for x
    x = 788,358.51/1,244.08
  6. Step 6: Final answer
    x = 633.69

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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.