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Finding the Fourth Proportional to 59.70, 89.56 and 21.19

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Solution

The fourth proportional to 59.70, 89.56 and 21.19 is: 31.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.70 : 89.56 = 21.19 : x
  2. Step 2: Convert to fraction form
    59.70/89.56 = 21.19/x
  3. Step 3: Cross multiply
    59.70x = 89.56 × 21.19
  4. Step 4: Simplify right side
    59.70x = 1,897.78
  5. Step 5: Solve for x
    x = 1,897.78/59.70
  6. Step 6: Final answer
    x = 31.79

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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.