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Finding the Fourth Proportional to 128,720.70, 193,023.45 and 49,808.70

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Solution

The fourth proportional to 128,720.70, 193,023.45 and 49,808.70 is: 74,690.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,720.70 : 193,023.45 = 49,808.70 : x
  2. Step 2: Convert to fraction form
    128,720.70/193,023.45 = 49,808.70/x
  3. Step 3: Cross multiply
    128,720.70x = 193,023.45 × 49,808.70
  4. Step 4: Simplify right side
    128,720.70x = 9,614,247,114.02
  5. Step 5: Solve for x
    x = 9,614,247,114.02/128,720.70
  6. Step 6: Final answer
    x = 74,690.76

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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.