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Finding the Fourth Proportional to 48.42, 72.84 and 40.76

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Solution

The fourth proportional to 48.42, 72.84 and 40.76 is: 61.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.42 : 72.84 = 40.76 : x
  2. Step 2: Convert to fraction form
    48.42/72.84 = 40.76/x
  3. Step 3: Cross multiply
    48.42x = 72.84 × 40.76
  4. Step 4: Simplify right side
    48.42x = 2,968.96
  5. Step 5: Solve for x
    x = 2,968.96/48.42
  6. Step 6: Final answer
    x = 61.32

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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.