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Finding the Fourth Proportional to 42.51, 58.55 and 38.91

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Solution

The fourth proportional to 42.51, 58.55 and 38.91 is: 53.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.51 : 58.55 = 38.91 : x
  2. Step 2: Convert to fraction form
    42.51/58.55 = 38.91/x
  3. Step 3: Cross multiply
    42.51x = 58.55 × 38.91
  4. Step 4: Simplify right side
    42.51x = 2,277.99
  5. Step 5: Solve for x
    x = 2,277.99/42.51
  6. Step 6: Final answer
    x = 53.59

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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.