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Finding the Fourth Proportional to 209,605.88, 289,329 and 124,721.12

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Solution

The fourth proportional to 209,605.88, 289,329 and 124,721.12 is: 172,158.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,605.88 : 289,329 = 124,721.12 : x
  2. Step 2: Convert to fraction form
    209,605.88/289,329 = 124,721.12/x
  3. Step 3: Cross multiply
    209,605.88x = 289,329 × 124,721.12
  4. Step 4: Simplify right side
    209,605.88x = 36,085,436,928.48
  5. Step 5: Solve for x
    x = 36,085,436,928.48/209,605.88
  6. Step 6: Final answer
    x = 172,158.51

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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.