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Finding the Fourth Proportional to 53.70, 74.06 and 42.03

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Solution

The fourth proportional to 53.70, 74.06 and 42.03 is: 57.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.70 : 74.06 = 42.03 : x
  2. Step 2: Convert to fraction form
    53.70/74.06 = 42.03/x
  3. Step 3: Cross multiply
    53.70x = 74.06 × 42.03
  4. Step 4: Simplify right side
    53.70x = 3,112.74
  5. Step 5: Solve for x
    x = 3,112.74/53.70
  6. Step 6: Final answer
    x = 57.97

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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.