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Finding the Fourth Proportional to 50.15, 74.91 and 42.89

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Solution

The fourth proportional to 50.15, 74.91 and 42.89 is: 64.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.15 : 74.91 = 42.89 : x
  2. Step 2: Convert to fraction form
    50.15/74.91 = 42.89/x
  3. Step 3: Cross multiply
    50.15x = 74.91 × 42.89
  4. Step 4: Simplify right side
    50.15x = 3,212.52
  5. Step 5: Solve for x
    x = 3,212.52/50.15
  6. Step 6: Final answer
    x = 64.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.