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Finding the Fourth Proportional to 55.29, 76.28 and 48

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Solution

The fourth proportional to 55.29, 76.28 and 48 is: 66.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.29 : 76.28 = 48 : x
  2. Step 2: Convert to fraction form
    55.29/76.28 = 48/x
  3. Step 3: Cross multiply
    55.29x = 76.28 × 48
  4. Step 4: Simplify right side
    55.29x = 3,661.20
  5. Step 5: Solve for x
    x = 3,661.20/55.29
  6. Step 6: Final answer
    x = 66.22

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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.