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Finding the Fourth Proportional to 58.72, 88.07 and 20.21

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Solution

The fourth proportional to 58.72, 88.07 and 20.21 is: 30.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.72 : 88.07 = 20.21 : x
  2. Step 2: Convert to fraction form
    58.72/88.07 = 20.21/x
  3. Step 3: Cross multiply
    58.72x = 88.07 × 20.21
  4. Step 4: Simplify right side
    58.72x = 1,779.45
  5. Step 5: Solve for x
    x = 1,779.45/58.72
  6. Step 6: Final answer
    x = 30.31

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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.