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Finding the Fourth Proportional to 1,225.88, 1,691.88 and 1,187.63

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Solution

The fourth proportional to 1,225.88, 1,691.88 and 1,187.63 is: 1,639.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.88 : 1,691.88 = 1,187.63 : x
  2. Step 2: Convert to fraction form
    1,225.88/1,691.88 = 1,187.63/x
  3. Step 3: Cross multiply
    1,225.88x = 1,691.88 × 1,187.63
  4. Step 4: Simplify right side
    1,225.88x = 2,009,327.44
  5. Step 5: Solve for x
    x = 2,009,327.44/1,225.88
  6. Step 6: Final answer
    x = 1,639.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.