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Finding the Fourth Proportional to 307,780.99, 423,797.54 and 278,912.87

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Solution

The fourth proportional to 307,780.99, 423,797.54 and 278,912.87 is: 384,047.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,780.99 : 423,797.54 = 278,912.87 : x
  2. Step 2: Convert to fraction form
    307,780.99/423,797.54 = 278,912.87/x
  3. Step 3: Cross multiply
    307,780.99x = 423,797.54 × 278,912.87
  4. Step 4: Simplify right side
    307,780.99x = 118,202,585,726.28
  5. Step 5: Solve for x
    x = 118,202,585,726.28/307,780.99
  6. Step 6: Final answer
    x = 384,047.71

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1.5x scale

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.