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Finding the Fourth Proportional to 493,398.70, 680,895.78 and 289,453.09

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Solution

The fourth proportional to 493,398.70, 680,895.78 and 289,453.09 is: 399,448.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    493,398.70 : 680,895.78 = 289,453.09 : x
  2. Step 2: Convert to fraction form
    493,398.70/680,895.78 = 289,453.09/x
  3. Step 3: Cross multiply
    493,398.70x = 680,895.78 × 289,453.09
  4. Step 4: Simplify right side
    493,398.70x = 197,087,385,977.95
  5. Step 5: Solve for x
    x = 197,087,385,977.95/493,398.70
  6. Step 6: Final answer
    x = 399,448.53

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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.