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Finding the Fourth Proportional to 42.68, 58.86 and 30.39

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Solution

The fourth proportional to 42.68, 58.86 and 30.39 is: 41.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.68 : 58.86 = 30.39 : x
  2. Step 2: Convert to fraction form
    42.68/58.86 = 30.39/x
  3. Step 3: Cross multiply
    42.68x = 58.86 × 30.39
  4. Step 4: Simplify right side
    42.68x = 1,788.76
  5. Step 5: Solve for x
    x = 1,788.76/42.68
  6. Step 6: Final answer
    x = 41.92

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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.