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Finding the Fourth Proportional to 78,872.70, 118,341.45 and 28,976.70

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Solution

The fourth proportional to 78,872.70, 118,341.45 and 28,976.70 is: 43,476.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,872.70 : 118,341.45 = 28,976.70 : x
  2. Step 2: Convert to fraction form
    78,872.70/118,341.45 = 28,976.70/x
  3. Step 3: Cross multiply
    78,872.70x = 118,341.45 × 28,976.70
  4. Step 4: Simplify right side
    78,872.70x = 3,429,144,694.22
  5. Step 5: Solve for x
    x = 3,429,144,694.22/78,872.70
  6. Step 6: Final answer
    x = 43,476.95

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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.