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Finding the Fourth Proportional to 67.40, 100.62 and 47.98

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Solution

The fourth proportional to 67.40, 100.62 and 47.98 is: 71.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.40 : 100.62 = 47.98 : x
  2. Step 2: Convert to fraction form
    67.40/100.62 = 47.98/x
  3. Step 3: Cross multiply
    67.40x = 100.62 × 47.98
  4. Step 4: Simplify right side
    67.40x = 4,827.75
  5. Step 5: Solve for x
    x = 4,827.75/67.40
  6. Step 6: Final answer
    x = 71.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.