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Finding the Fourth Proportional to 128,031.20, 191,701.20 and 100,383.20

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Solution

The fourth proportional to 128,031.20, 191,701.20 and 100,383.20 is: 150,303.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,031.20 : 191,701.20 = 100,383.20 : x
  2. Step 2: Convert to fraction form
    128,031.20/191,701.20 = 100,383.20/x
  3. Step 3: Cross multiply
    128,031.20x = 191,701.20 × 100,383.20
  4. Step 4: Simplify right side
    128,031.20x = 19,243,579,899.84
  5. Step 5: Solve for x
    x = 19,243,579,899.84/128,031.20
  6. Step 6: Final answer
    x = 150,303.83

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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.