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Finding the Fourth Proportional to 123.83, 185.35 and 65.90

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Solution

The fourth proportional to 123.83, 185.35 and 65.90 is: 98.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.83 : 185.35 = 65.90 : x
  2. Step 2: Convert to fraction form
    123.83/185.35 = 65.90/x
  3. Step 3: Cross multiply
    123.83x = 185.35 × 65.90
  4. Step 4: Simplify right side
    123.83x = 12,214.57
  5. Step 5: Solve for x
    x = 12,214.57/123.83
  6. Step 6: Final answer
    x = 98.64

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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.