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Finding the Fourth Proportional to 55.72, 76.90 and 31.17

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Solution

The fourth proportional to 55.72, 76.90 and 31.17 is: 43.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.72 : 76.90 = 31.17 : x
  2. Step 2: Convert to fraction form
    55.72/76.90 = 31.17/x
  3. Step 3: Cross multiply
    55.72x = 76.90 × 31.17
  4. Step 4: Simplify right side
    55.72x = 2,396.81
  5. Step 5: Solve for x
    x = 2,396.81/55.72
  6. Step 6: Final answer
    x = 43.01

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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.