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Finding the Fourth Proportional to 78,108.96, 117,089.60 and 70,949.28

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Solution

The fourth proportional to 78,108.96, 117,089.60 and 70,949.28 is: 106,356.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,108.96 : 117,089.60 = 70,949.28 : x
  2. Step 2: Convert to fraction form
    78,108.96/117,089.60 = 70,949.28/x
  3. Step 3: Cross multiply
    78,108.96x = 117,089.60 × 70,949.28
  4. Step 4: Simplify right side
    78,108.96x = 8,307,422,815.49
  5. Step 5: Solve for x
    x = 8,307,422,815.49/78,108.96
  6. Step 6: Final answer
    x = 106,356.85

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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.