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Finding the Fourth Proportional to 78,949.79, 108,950.87 and 43,140.40

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Solution

The fourth proportional to 78,949.79, 108,950.87 and 43,140.40 is: 59,533.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,949.79 : 108,950.87 = 43,140.40 : x
  2. Step 2: Convert to fraction form
    78,949.79/108,950.87 = 43,140.40/x
  3. Step 3: Cross multiply
    78,949.79x = 108,950.87 × 43,140.40
  4. Step 4: Simplify right side
    78,949.79x = 4,700,183,947.62
  5. Step 5: Solve for x
    x = 4,700,183,947.62/78,949.79
  6. Step 6: Final answer
    x = 59,533.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.