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Finding the Fourth Proportional to 60.21, 90.48 and 45.79

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Solution

The fourth proportional to 60.21, 90.48 and 45.79 is: 68.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.21 : 90.48 = 45.79 : x
  2. Step 2: Convert to fraction form
    60.21/90.48 = 45.79/x
  3. Step 3: Cross multiply
    60.21x = 90.48 × 45.79
  4. Step 4: Simplify right side
    60.21x = 4,143.08
  5. Step 5: Solve for x
    x = 4,143.08/60.21
  6. Step 6: Final answer
    x = 68.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.