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Finding the Fourth Proportional to 55.40, 76.49 and 39.06

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Solution

The fourth proportional to 55.40, 76.49 and 39.06 is: 53.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.40 : 76.49 = 39.06 : x
  2. Step 2: Convert to fraction form
    55.40/76.49 = 39.06/x
  3. Step 3: Cross multiply
    55.40x = 76.49 × 39.06
  4. Step 4: Simplify right side
    55.40x = 2,987.70
  5. Step 5: Solve for x
    x = 2,987.70/55.40
  6. Step 6: Final answer
    x = 53.93

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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.