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Finding the Fourth Proportional to 191.88, 287.80 and 61.87

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Solution

The fourth proportional to 191.88, 287.80 and 61.87 is: 92.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.88 : 287.80 = 61.87 : x
  2. Step 2: Convert to fraction form
    191.88/287.80 = 61.87/x
  3. Step 3: Cross multiply
    191.88x = 287.80 × 61.87
  4. Step 4: Simplify right side
    191.88x = 17,806.40
  5. Step 5: Solve for x
    x = 17,806.40/191.88
  6. Step 6: Final answer
    x = 92.80

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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.