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Finding the Fourth Proportional to 53.15, 73.38 and 42.20

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Solution

The fourth proportional to 53.15, 73.38 and 42.20 is: 58.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.15 : 73.38 = 42.20 : x
  2. Step 2: Convert to fraction form
    53.15/73.38 = 42.20/x
  3. Step 3: Cross multiply
    53.15x = 73.38 × 42.20
  4. Step 4: Simplify right side
    53.15x = 3,096.64
  5. Step 5: Solve for x
    x = 3,096.64/53.15
  6. Step 6: Final answer
    x = 58.26

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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.