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Finding the Fourth Proportional to 53.75, 74.18 and 42.70

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Solution

The fourth proportional to 53.75, 74.18 and 42.70 is: 58.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.75 : 74.18 = 42.70 : x
  2. Step 2: Convert to fraction form
    53.75/74.18 = 42.70/x
  3. Step 3: Cross multiply
    53.75x = 74.18 × 42.70
  4. Step 4: Simplify right side
    53.75x = 3,167.49
  5. Step 5: Solve for x
    x = 3,167.49/53.75
  6. Step 6: Final answer
    x = 58.93

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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.