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Finding the Fourth Proportional to 42.62, 58.79 and 34.40

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Solution

The fourth proportional to 42.62, 58.79 and 34.40 is: 47.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.62 : 58.79 = 34.40 : x
  2. Step 2: Convert to fraction form
    42.62/58.79 = 34.40/x
  3. Step 3: Cross multiply
    42.62x = 58.79 × 34.40
  4. Step 4: Simplify right side
    42.62x = 2,021.91
  5. Step 5: Solve for x
    x = 2,021.91/42.62
  6. Step 6: Final answer
    x = 47.45

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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.