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Finding the Fourth Proportional to 59.80, 82.40 and 42.28

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Solution

The fourth proportional to 59.80, 82.40 and 42.28 is: 58.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.80 : 82.40 = 42.28 : x
  2. Step 2: Convert to fraction form
    59.80/82.40 = 42.28/x
  3. Step 3: Cross multiply
    59.80x = 82.40 × 42.28
  4. Step 4: Simplify right side
    59.80x = 3,483.87
  5. Step 5: Solve for x
    x = 3,483.87/59.80
  6. Step 6: Final answer
    x = 58.26

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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.