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Finding the Fourth Proportional to 191.64, 287.40 and 54.68

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Solution

The fourth proportional to 191.64, 287.40 and 54.68 is: 81.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.64 : 287.40 = 54.68 : x
  2. Step 2: Convert to fraction form
    191.64/287.40 = 54.68/x
  3. Step 3: Cross multiply
    191.64x = 287.40 × 54.68
  4. Step 4: Simplify right side
    191.64x = 15,713.80
  5. Step 5: Solve for x
    x = 15,713.80/191.64
  6. Step 6: Final answer
    x = 81.99

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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.