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Finding the Fourth Proportional to 78,819.40, 118,229.10 and 47,715.40

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Solution

The fourth proportional to 78,819.40, 118,229.10 and 47,715.40 is: 71,573.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,819.40 : 118,229.10 = 47,715.40 : x
  2. Step 2: Convert to fraction form
    78,819.40/118,229.10 = 47,715.40/x
  3. Step 3: Cross multiply
    78,819.40x = 118,229.10 × 47,715.40
  4. Step 4: Simplify right side
    78,819.40x = 5,641,348,798.14
  5. Step 5: Solve for x
    x = 5,641,348,798.14/78,819.40
  6. Step 6: Final answer
    x = 71,573.10

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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.