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Finding the Fourth Proportional to 58.63, 87.92 and 21.05

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Solution

The fourth proportional to 58.63, 87.92 and 21.05 is: 31.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.63 : 87.92 = 21.05 : x
  2. Step 2: Convert to fraction form
    58.63/87.92 = 21.05/x
  3. Step 3: Cross multiply
    58.63x = 87.92 × 21.05
  4. Step 4: Simplify right side
    58.63x = 1,850.72
  5. Step 5: Solve for x
    x = 1,850.72/58.63
  6. Step 6: Final answer
    x = 31.57

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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.