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Finding the Fourth Proportional to 72.60, 99.90 and 67.98

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Solution

The fourth proportional to 72.60, 99.90 and 67.98 is: 93.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.60 : 99.90 = 67.98 : x
  2. Step 2: Convert to fraction form
    72.60/99.90 = 67.98/x
  3. Step 3: Cross multiply
    72.60x = 99.90 × 67.98
  4. Step 4: Simplify right side
    72.60x = 6,791.20
  5. Step 5: Solve for x
    x = 6,791.20/72.60
  6. Step 6: Final answer
    x = 93.54

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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.