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Finding the Fourth Proportional to 128,009.84, 191,991.68 and 34,493.76

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Solution

The fourth proportional to 128,009.84, 191,991.68 and 34,493.76 is: 51,734.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,009.84 : 191,991.68 = 34,493.76 : x
  2. Step 2: Convert to fraction form
    128,009.84/191,991.68 = 34,493.76/x
  3. Step 3: Cross multiply
    128,009.84x = 191,991.68 × 34,493.76
  4. Step 4: Simplify right side
    128,009.84x = 6,622,514,931.92
  5. Step 5: Solve for x
    x = 6,622,514,931.92/128,009.84
  6. Step 6: Final answer
    x = 51,734.42

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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.