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Finding the Fourth Proportional to 620,805, 856,710.90 and 338,181

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Solution

The fourth proportional to 620,805, 856,710.90 and 338,181 is: 466,689.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,805 : 856,710.90 = 338,181 : x
  2. Step 2: Convert to fraction form
    620,805/856,710.90 = 338,181/x
  3. Step 3: Cross multiply
    620,805x = 856,710.90 × 338,181
  4. Step 4: Simplify right side
    620,805x = 289,723,348,872.90
  5. Step 5: Solve for x
    x = 289,723,348,872.90/620,805
  6. Step 6: Final answer
    x = 466,689.78

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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.