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Finding the Fourth Proportional to 771.11, 1,156.65 and 186.11

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Solution

The fourth proportional to 771.11, 1,156.65 and 186.11 is: 279.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.11 : 1,156.65 = 186.11 : x
  2. Step 2: Convert to fraction form
    771.11/1,156.65 = 186.11/x
  3. Step 3: Cross multiply
    771.11x = 1,156.65 × 186.11
  4. Step 4: Simplify right side
    771.11x = 215,258.78
  5. Step 5: Solve for x
    x = 215,258.78/771.11
  6. Step 6: Final answer
    x = 279.15

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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.