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Finding the Fourth Proportional to 78,099.81, 117,149.32 and 18,935.49

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Solution

The fourth proportional to 78,099.81, 117,149.32 and 18,935.49 is: 28,403.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,099.81 : 117,149.32 = 18,935.49 : x
  2. Step 2: Convert to fraction form
    78,099.81/117,149.32 = 18,935.49/x
  3. Step 3: Cross multiply
    78,099.81x = 117,149.32 × 18,935.49
  4. Step 4: Simplify right side
    78,099.81x = 2,218,279,777.37
  5. Step 5: Solve for x
    x = 2,218,279,777.37/78,099.81
  6. Step 6: Final answer
    x = 28,403.14

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1.5x scale

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.