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Finding the Fourth Proportional to 1,187.56, 1,770.12 and 1,129.07

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Solution

The fourth proportional to 1,187.56, 1,770.12 and 1,129.07 is: 1,682.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.56 : 1,770.12 = 1,129.07 : x
  2. Step 2: Convert to fraction form
    1,187.56/1,770.12 = 1,129.07/x
  3. Step 3: Cross multiply
    1,187.56x = 1,770.12 × 1,129.07
  4. Step 4: Simplify right side
    1,187.56x = 1,998,593.81
  5. Step 5: Solve for x
    x = 1,998,593.81/1,187.56
  6. Step 6: Final answer
    x = 1,682.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.