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Finding the Fourth Proportional to 60.79, 83.91 and 47.64

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Solution

The fourth proportional to 60.79, 83.91 and 47.64 is: 65.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.79 : 83.91 = 47.64 : x
  2. Step 2: Convert to fraction form
    60.79/83.91 = 47.64/x
  3. Step 3: Cross multiply
    60.79x = 83.91 × 47.64
  4. Step 4: Simplify right side
    60.79x = 3,997.47
  5. Step 5: Solve for x
    x = 3,997.47/60.79
  6. Step 6: Final answer
    x = 65.76

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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.