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Finding the Fourth Proportional to 61.58, 91.90 and 55.82

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Solution

The fourth proportional to 61.58, 91.90 and 55.82 is: 83.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.58 : 91.90 = 55.82 : x
  2. Step 2: Convert to fraction form
    61.58/91.90 = 55.82/x
  3. Step 3: Cross multiply
    61.58x = 91.90 × 55.82
  4. Step 4: Simplify right side
    61.58x = 5,129.86
  5. Step 5: Solve for x
    x = 5,129.86/61.58
  6. Step 6: Final answer
    x = 83.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.