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Finding the Fourth Proportional to 402,805.45, 555,860.43 and 221,517.38

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Solution

The fourth proportional to 402,805.45, 555,860.43 and 221,517.38 is: 305,687.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,805.45 : 555,860.43 = 221,517.38 : x
  2. Step 2: Convert to fraction form
    402,805.45/555,860.43 = 221,517.38/x
  3. Step 3: Cross multiply
    402,805.45x = 555,860.43 × 221,517.38
  4. Step 4: Simplify right side
    402,805.45x = 123,132,746,099.27
  5. Step 5: Solve for x
    x = 123,132,746,099.27/402,805.45
  6. Step 6: Final answer
    x = 305,687.89

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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.