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Finding the Fourth Proportional to 48.40, 66.18 and 47.12

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Solution

The fourth proportional to 48.40, 66.18 and 47.12 is: 64.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.40 : 66.18 = 47.12 : x
  2. Step 2: Convert to fraction form
    48.40/66.18 = 47.12/x
  3. Step 3: Cross multiply
    48.40x = 66.18 × 47.12
  4. Step 4: Simplify right side
    48.40x = 3,118.40
  5. Step 5: Solve for x
    x = 3,118.40/48.40
  6. Step 6: Final answer
    x = 64.43

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.