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Finding the Fourth Proportional to 65.21, 90.09 and 58.31

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Solution

The fourth proportional to 65.21, 90.09 and 58.31 is: 80.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.21 : 90.09 = 58.31 : x
  2. Step 2: Convert to fraction form
    65.21/90.09 = 58.31/x
  3. Step 3: Cross multiply
    65.21x = 90.09 × 58.31
  4. Step 4: Simplify right side
    65.21x = 5,252.70
  5. Step 5: Solve for x
    x = 5,252.70/65.21
  6. Step 6: Final answer
    x = 80.56

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.