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Finding the Fourth Proportional to 55.79, 76.98 and 31.23

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Solution

The fourth proportional to 55.79, 76.98 and 31.23 is: 43.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.79 : 76.98 = 31.23 : x
  2. Step 2: Convert to fraction form
    55.79/76.98 = 31.23/x
  3. Step 3: Cross multiply
    55.79x = 76.98 × 31.23
  4. Step 4: Simplify right side
    55.79x = 2,403.94
  5. Step 5: Solve for x
    x = 2,403.94/55.79
  6. Step 6: Final answer
    x = 43.09

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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.