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Finding the Fourth Proportional to 61.90, 92.90 and 25.86

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Solution

The fourth proportional to 61.90, 92.90 and 25.86 is: 38.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.90 : 92.90 = 25.86 : x
  2. Step 2: Convert to fraction form
    61.90/92.90 = 25.86/x
  3. Step 3: Cross multiply
    61.90x = 92.90 × 25.86
  4. Step 4: Simplify right side
    61.90x = 2,402.39
  5. Step 5: Solve for x
    x = 2,402.39/61.90
  6. Step 6: Final answer
    x = 38.81

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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.