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Finding the Fourth Proportional to 128,089.20, 191,874.60 and 72,620.40

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Solution

The fourth proportional to 128,089.20, 191,874.60 and 72,620.40 is: 108,783.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,089.20 : 191,874.60 = 72,620.40 : x
  2. Step 2: Convert to fraction form
    128,089.20/191,874.60 = 72,620.40/x
  3. Step 3: Cross multiply
    128,089.20x = 191,874.60 × 72,620.40
  4. Step 4: Simplify right side
    128,089.20x = 13,934,010,201.84
  5. Step 5: Solve for x
    x = 13,934,010,201.84/128,089.20
  6. Step 6: Final answer
    x = 108,783.65

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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.