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Finding the Fourth Proportional to 128,212.35, 176,905.62 and 74,469.55

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Solution

The fourth proportional to 128,212.35, 176,905.62 and 74,469.55 is: 102,752.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,212.35 : 176,905.62 = 74,469.55 : x
  2. Step 2: Convert to fraction form
    128,212.35/176,905.62 = 74,469.55/x
  3. Step 3: Cross multiply
    128,212.35x = 176,905.62 × 74,469.55
  4. Step 4: Simplify right side
    128,212.35x = 13,174,081,913.87
  5. Step 5: Solve for x
    x = 13,174,081,913.87/128,212.35
  6. Step 6: Final answer
    x = 102,752.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.