Home / 409,215.24-613,919.16-128,732.40

Finding the Fourth Proportional to 409,215.24, 613,919.16 and 128,732.40

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Solution

The fourth proportional to 409,215.24, 613,919.16 and 128,732.40 is: 193,128.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,215.24 : 613,919.16 = 128,732.40 : x
  2. Step 2: Convert to fraction form
    409,215.24/613,919.16 = 128,732.40/x
  3. Step 3: Cross multiply
    409,215.24x = 613,919.16 × 128,732.40
  4. Step 4: Simplify right side
    409,215.24x = 79,031,286,872.78
  5. Step 5: Solve for x
    x = 79,031,286,872.78/409,215.24
  6. Step 6: Final answer
    x = 193,128.89

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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.