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Finding the Fourth Proportional to 58.05, 86.85 and 42.84

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Solution

The fourth proportional to 58.05, 86.85 and 42.84 is: 64.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.05 : 86.85 = 42.84 : x
  2. Step 2: Convert to fraction form
    58.05/86.85 = 42.84/x
  3. Step 3: Cross multiply
    58.05x = 86.85 × 42.84
  4. Step 4: Simplify right side
    58.05x = 3,720.65
  5. Step 5: Solve for x
    x = 3,720.65/58.05
  6. Step 6: Final answer
    x = 64.09

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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.