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Finding the Fourth Proportional to 78,099.45, 117,149.16 and 18,935.13

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Solution

The fourth proportional to 78,099.45, 117,149.16 and 18,935.13 is: 28,402.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,099.45 : 117,149.16 = 18,935.13 : x
  2. Step 2: Convert to fraction form
    78,099.45/117,149.16 = 18,935.13/x
  3. Step 3: Cross multiply
    78,099.45x = 117,149.16 × 18,935.13
  4. Step 4: Simplify right side
    78,099.45x = 2,218,234,573.99
  5. Step 5: Solve for x
    x = 2,218,234,573.99/78,099.45
  6. Step 6: Final answer
    x = 28,402.69

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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.