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Finding the Fourth Proportional to 279,208.80, 418,813.20 and 172,920.60

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Solution

The fourth proportional to 279,208.80, 418,813.20 and 172,920.60 is: 259,380.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,208.80 : 418,813.20 = 172,920.60 : x
  2. Step 2: Convert to fraction form
    279,208.80/418,813.20 = 172,920.60/x
  3. Step 3: Cross multiply
    279,208.80x = 418,813.20 × 172,920.60
  4. Step 4: Simplify right side
    279,208.80x = 72,421,429,831.92
  5. Step 5: Solve for x
    x = 72,421,429,831.92/279,208.80
  6. Step 6: Final answer
    x = 259,380.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.