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Finding the Fourth Proportional to 55.69, 76.86 and 31.13

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Solution

The fourth proportional to 55.69, 76.86 and 31.13 is: 42.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.69 : 76.86 = 31.13 : x
  2. Step 2: Convert to fraction form
    55.69/76.86 = 31.13/x
  3. Step 3: Cross multiply
    55.69x = 76.86 × 31.13
  4. Step 4: Simplify right side
    55.69x = 2,392.92
  5. Step 5: Solve for x
    x = 2,392.92/55.69
  6. Step 6: Final answer
    x = 42.97

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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.