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Finding the Fourth Proportional to 620,472.40, 856,332.52 and 378,704.72

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Solution

The fourth proportional to 620,472.40, 856,332.52 and 378,704.72 is: 522,661.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,472.40 : 856,332.52 = 378,704.72 : x
  2. Step 2: Convert to fraction form
    620,472.40/856,332.52 = 378,704.72/x
  3. Step 3: Cross multiply
    620,472.40x = 856,332.52 × 378,704.72
  4. Step 4: Simplify right side
    620,472.40x = 324,297,167,213.49
  5. Step 5: Solve for x
    x = 324,297,167,213.49/620,472.40
  6. Step 6: Final answer
    x = 522,661.71

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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.