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Finding the Fourth Proportional to 78,871.19, 118,236.28 and 28,939.71

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Solution

The fourth proportional to 78,871.19, 118,236.28 and 28,939.71 is: 43,383.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,871.19 : 118,236.28 = 28,939.71 : x
  2. Step 2: Convert to fraction form
    78,871.19/118,236.28 = 28,939.71/x
  3. Step 3: Cross multiply
    78,871.19x = 118,236.28 × 28,939.71
  4. Step 4: Simplify right side
    78,871.19x = 3,421,723,163.75
  5. Step 5: Solve for x
    x = 3,421,723,163.75/78,871.19
  6. Step 6: Final answer
    x = 43,383.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.