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Finding the Fourth Proportional to 1,186.85, 1,781.53 and 969.98

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Solution

The fourth proportional to 1,186.85, 1,781.53 and 969.98 is: 1,455.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.85 : 1,781.53 = 969.98 : x
  2. Step 2: Convert to fraction form
    1,186.85/1,781.53 = 969.98/x
  3. Step 3: Cross multiply
    1,186.85x = 1,781.53 × 969.98
  4. Step 4: Simplify right side
    1,186.85x = 1,728,041.23
  5. Step 5: Solve for x
    x = 1,728,041.23/1,186.85
  6. Step 6: Final answer
    x = 1,455.99

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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.