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Finding the Fourth Proportional to 55.23, 75.20 and 55.05

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Solution

The fourth proportional to 55.23, 75.20 and 55.05 is: 74.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.23 : 75.20 = 55.05 : x
  2. Step 2: Convert to fraction form
    55.23/75.20 = 55.05/x
  3. Step 3: Cross multiply
    55.23x = 75.20 × 55.05
  4. Step 4: Simplify right side
    55.23x = 4,139.20
  5. Step 5: Solve for x
    x = 4,139.20/55.23
  6. Step 6: Final answer
    x = 74.94

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.