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Finding the Fourth Proportional to 59.72, 89.61 and 19.15

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Solution

The fourth proportional to 59.72, 89.61 and 19.15 is: 28.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.72 : 89.61 = 19.15 : x
  2. Step 2: Convert to fraction form
    59.72/89.61 = 19.15/x
  3. Step 3: Cross multiply
    59.72x = 89.61 × 19.15
  4. Step 4: Simplify right side
    59.72x = 1,716.03
  5. Step 5: Solve for x
    x = 1,716.03/59.72
  6. Step 6: Final answer
    x = 28.74

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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.