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Finding the Fourth Proportional to 55.58, 83.60 and 42.82

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Solution

The fourth proportional to 55.58, 83.60 and 42.82 is: 64.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.58 : 83.60 = 42.82 : x
  2. Step 2: Convert to fraction form
    55.58/83.60 = 42.82/x
  3. Step 3: Cross multiply
    55.58x = 83.60 × 42.82
  4. Step 4: Simplify right side
    55.58x = 3,579.49
  5. Step 5: Solve for x
    x = 3,579.49/55.58
  6. Step 6: Final answer
    x = 64.41

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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.