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Finding the Fourth Proportional to 128,494.80, 192,742.20 and 45,397.20

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Solution

The fourth proportional to 128,494.80, 192,742.20 and 45,397.20 is: 68,095.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,494.80 : 192,742.20 = 45,397.20 : x
  2. Step 2: Convert to fraction form
    128,494.80/192,742.20 = 45,397.20/x
  3. Step 3: Cross multiply
    128,494.80x = 192,742.20 × 45,397.20
  4. Step 4: Simplify right side
    128,494.80x = 8,749,956,201.84
  5. Step 5: Solve for x
    x = 8,749,956,201.84/128,494.80
  6. Step 6: Final answer
    x = 68,095.80

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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.