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Finding the Fourth Proportional to 520,609.36, 781,034.33 and 221,099.71

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Solution

The fourth proportional to 520,609.36, 781,034.33 and 221,099.71 is: 331,700.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,609.36 : 781,034.33 = 221,099.71 : x
  2. Step 2: Convert to fraction form
    520,609.36/781,034.33 = 221,099.71/x
  3. Step 3: Cross multiply
    520,609.36x = 781,034.33 × 221,099.71
  4. Step 4: Simplify right side
    520,609.36x = 172,686,463,863.04
  5. Step 5: Solve for x
    x = 172,686,463,863.04/520,609.36
  6. Step 6: Final answer
    x = 331,700.65

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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.