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Finding the Fourth Proportional to 65.72, 90.22 and 58.43

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Solution

The fourth proportional to 65.72, 90.22 and 58.43 is: 80.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.72 : 90.22 = 58.43 : x
  2. Step 2: Convert to fraction form
    65.72/90.22 = 58.43/x
  3. Step 3: Cross multiply
    65.72x = 90.22 × 58.43
  4. Step 4: Simplify right side
    65.72x = 5,271.55
  5. Step 5: Solve for x
    x = 5,271.55/65.72
  6. Step 6: Final answer
    x = 80.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.