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Finding the Fourth Proportional to 55.89, 77.09 and 40.40

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Solution

The fourth proportional to 55.89, 77.09 and 40.40 is: 55.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.89 : 77.09 = 40.40 : x
  2. Step 2: Convert to fraction form
    55.89/77.09 = 40.40/x
  3. Step 3: Cross multiply
    55.89x = 77.09 × 40.40
  4. Step 4: Simplify right side
    55.89x = 3,114.43
  5. Step 5: Solve for x
    x = 3,114.43/55.89
  6. Step 6: Final answer
    x = 55.72

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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.