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Finding the Fourth Proportional to 59.39, 81.80 and 51.20

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Solution

The fourth proportional to 59.39, 81.80 and 51.20 is: 70.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.39 : 81.80 = 51.20 : x
  2. Step 2: Convert to fraction form
    59.39/81.80 = 51.20/x
  3. Step 3: Cross multiply
    59.39x = 81.80 × 51.20
  4. Step 4: Simplify right side
    59.39x = 4,188.30
  5. Step 5: Solve for x
    x = 4,188.30/59.39
  6. Step 6: Final answer
    x = 70.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.