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Finding the Fourth Proportional to 53.51, 73.84 and 30.20

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Solution

The fourth proportional to 53.51, 73.84 and 30.20 is: 41.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.51 : 73.84 = 30.20 : x
  2. Step 2: Convert to fraction form
    53.51/73.84 = 30.20/x
  3. Step 3: Cross multiply
    53.51x = 73.84 × 30.20
  4. Step 4: Simplify right side
    53.51x = 2,229.58
  5. Step 5: Solve for x
    x = 2,229.58/53.51
  6. Step 6: Final answer
    x = 41.67

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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.