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Finding the Fourth Proportional to 58.23, 87.30 and 31.20

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Solution

The fourth proportional to 58.23, 87.30 and 31.20 is: 46.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.23 : 87.30 = 31.20 : x
  2. Step 2: Convert to fraction form
    58.23/87.30 = 31.20/x
  3. Step 3: Cross multiply
    58.23x = 87.30 × 31.20
  4. Step 4: Simplify right side
    58.23x = 2,723.76
  5. Step 5: Solve for x
    x = 2,723.76/58.23
  6. Step 6: Final answer
    x = 46.78

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.