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Finding the Fourth Proportional to 58.20, 87.31 and 19.69

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Solution

The fourth proportional to 58.20, 87.31 and 19.69 is: 29.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.20 : 87.31 = 19.69 : x
  2. Step 2: Convert to fraction form
    58.20/87.31 = 19.69/x
  3. Step 3: Cross multiply
    58.20x = 87.31 × 19.69
  4. Step 4: Simplify right side
    58.20x = 1,718.60
  5. Step 5: Solve for x
    x = 1,718.60/58.20
  6. Step 6: Final answer
    x = 29.53

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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.