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Finding the Fourth Proportional to 72.42, 99.90 and 67.86

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Solution

The fourth proportional to 72.42, 99.90 and 67.86 is: 93.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.42 : 99.90 = 67.86 : x
  2. Step 2: Convert to fraction form
    72.42/99.90 = 67.86/x
  3. Step 3: Cross multiply
    72.42x = 99.90 × 67.86
  4. Step 4: Simplify right side
    72.42x = 6,779.21
  5. Step 5: Solve for x
    x = 6,779.21/72.42
  6. Step 6: Final answer
    x = 93.61

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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.