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Finding the Fourth Proportional to 58.11, 87.21 and 30.72

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Solution

The fourth proportional to 58.11, 87.21 and 30.72 is: 46.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.11 : 87.21 = 30.72 : x
  2. Step 2: Convert to fraction form
    58.11/87.21 = 30.72/x
  3. Step 3: Cross multiply
    58.11x = 87.21 × 30.72
  4. Step 4: Simplify right side
    58.11x = 2,679.09
  5. Step 5: Solve for x
    x = 2,679.09/58.11
  6. Step 6: Final answer
    x = 46.10

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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.