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Finding the Fourth Proportional to 620,195.13, 930,425.20 and 215,399.86

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Solution

The fourth proportional to 620,195.13, 930,425.20 and 215,399.86 is: 323,145.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,195.13 : 930,425.20 = 215,399.86 : x
  2. Step 2: Convert to fraction form
    620,195.13/930,425.20 = 215,399.86/x
  3. Step 3: Cross multiply
    620,195.13x = 930,425.20 × 215,399.86
  4. Step 4: Simplify right side
    620,195.13x = 200,413,454,955.91
  5. Step 5: Solve for x
    x = 200,413,454,955.91/620,195.13
  6. Step 6: Final answer
    x = 323,145.81

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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.