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Finding the Fourth Proportional to 1,193.12, 1,645.74 and 861.02

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Solution

The fourth proportional to 1,193.12, 1,645.74 and 861.02 is: 1,187.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,193.12 : 1,645.74 = 861.02 : x
  2. Step 2: Convert to fraction form
    1,193.12/1,645.74 = 861.02/x
  3. Step 3: Cross multiply
    1,193.12x = 1,645.74 × 861.02
  4. Step 4: Simplify right side
    1,193.12x = 1,417,015.05
  5. Step 5: Solve for x
    x = 1,417,015.05/1,193.12
  6. Step 6: Final answer
    x = 1,187.66

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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.