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Finding the Fourth Proportional to 78,979.32, 118,489.76 and 28,383.46

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Solution

The fourth proportional to 78,979.32, 118,489.76 and 28,383.46 is: 42,582.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,979.32 : 118,489.76 = 28,383.46 : x
  2. Step 2: Convert to fraction form
    78,979.32/118,489.76 = 28,383.46/x
  3. Step 3: Cross multiply
    78,979.32x = 118,489.76 × 28,383.46
  4. Step 4: Simplify right side
    78,979.32x = 3,363,149,476.00
  5. Step 5: Solve for x
    x = 3,363,149,476.00/78,979.32
  6. Step 6: Final answer
    x = 42,582.66

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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.