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Finding the Fourth Proportional to 65.20, 89.98 and 48.79

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Solution

The fourth proportional to 65.20, 89.98 and 48.79 is: 67.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.20 : 89.98 = 48.79 : x
  2. Step 2: Convert to fraction form
    65.20/89.98 = 48.79/x
  3. Step 3: Cross multiply
    65.20x = 89.98 × 48.79
  4. Step 4: Simplify right side
    65.20x = 4,389.88
  5. Step 5: Solve for x
    x = 4,389.88/65.20
  6. Step 6: Final answer
    x = 67.33

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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.