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Finding the Fourth Proportional to 42.65, 58.89 and 31

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Solution

The fourth proportional to 42.65, 58.89 and 31 is: 42.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.65 : 58.89 = 31 : x
  2. Step 2: Convert to fraction form
    42.65/58.89 = 31/x
  3. Step 3: Cross multiply
    42.65x = 58.89 × 31
  4. Step 4: Simplify right side
    42.65x = 1,825.59
  5. Step 5: Solve for x
    x = 1,825.59/42.65
  6. Step 6: Final answer
    x = 42.80

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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.