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Finding the Fourth Proportional to 58.73, 87.21 and 57.11

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Solution

The fourth proportional to 58.73, 87.21 and 57.11 is: 84.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.73 : 87.21 = 57.11 : x
  2. Step 2: Convert to fraction form
    58.73/87.21 = 57.11/x
  3. Step 3: Cross multiply
    58.73x = 87.21 × 57.11
  4. Step 4: Simplify right side
    58.73x = 4,980.13
  5. Step 5: Solve for x
    x = 4,980.13/58.73
  6. Step 6: Final answer
    x = 84.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.