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Finding the Fourth Proportional to 42.72, 58.86 and 40.59

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Solution

The fourth proportional to 42.72, 58.86 and 40.59 is: 55.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.72 : 58.86 = 40.59 : x
  2. Step 2: Convert to fraction form
    42.72/58.86 = 40.59/x
  3. Step 3: Cross multiply
    42.72x = 58.86 × 40.59
  4. Step 4: Simplify right side
    42.72x = 2,389.13
  5. Step 5: Solve for x
    x = 2,389.13/42.72
  6. Step 6: Final answer
    x = 55.93

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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.