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Finding the Fourth Proportional to 71.94, 99.29 and 40.86

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Solution

The fourth proportional to 71.94, 99.29 and 40.86 is: 56.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.94 : 99.29 = 40.86 : x
  2. Step 2: Convert to fraction form
    71.94/99.29 = 40.86/x
  3. Step 3: Cross multiply
    71.94x = 99.29 × 40.86
  4. Step 4: Simplify right side
    71.94x = 4,056.79
  5. Step 5: Solve for x
    x = 4,056.79/71.94
  6. Step 6: Final answer
    x = 56.39

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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.