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Finding the Fourth Proportional to 61.03, 91.31 and 30.50

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Solution

The fourth proportional to 61.03, 91.31 and 30.50 is: 45.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.03 : 91.31 = 30.50 : x
  2. Step 2: Convert to fraction form
    61.03/91.31 = 30.50/x
  3. Step 3: Cross multiply
    61.03x = 91.31 × 30.50
  4. Step 4: Simplify right side
    61.03x = 2,785.03
  5. Step 5: Solve for x
    x = 2,785.03/61.03
  6. Step 6: Final answer
    x = 45.64

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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.