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Finding the Fourth Proportional to 123.80, 185.73 and 87.80

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Solution

The fourth proportional to 123.80, 185.73 and 87.80 is: 131.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.80 : 185.73 = 87.80 : x
  2. Step 2: Convert to fraction form
    123.80/185.73 = 87.80/x
  3. Step 3: Cross multiply
    123.80x = 185.73 × 87.80
  4. Step 4: Simplify right side
    123.80x = 16,307.09
  5. Step 5: Solve for x
    x = 16,307.09/123.80
  6. Step 6: Final answer
    x = 131.72

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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.