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Finding the Fourth Proportional to 60.42, 83.31 and 47.28

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Solution

The fourth proportional to 60.42, 83.31 and 47.28 is: 65.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.42 : 83.31 = 47.28 : x
  2. Step 2: Convert to fraction form
    60.42/83.31 = 47.28/x
  3. Step 3: Cross multiply
    60.42x = 83.31 × 47.28
  4. Step 4: Simplify right side
    60.42x = 3,939.43
  5. Step 5: Solve for x
    x = 3,939.43/60.42
  6. Step 6: Final answer
    x = 65.20

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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.