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Finding the Fourth Proportional to 326,520.80, 489,781.20 and 279,281.60

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Solution

The fourth proportional to 326,520.80, 489,781.20 and 279,281.60 is: 418,922.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,520.80 : 489,781.20 = 279,281.60 : x
  2. Step 2: Convert to fraction form
    326,520.80/489,781.20 = 279,281.60/x
  3. Step 3: Cross multiply
    326,520.80x = 489,781.20 × 279,281.60
  4. Step 4: Simplify right side
    326,520.80x = 136,786,877,185.92
  5. Step 5: Solve for x
    x = 136,786,877,185.92/326,520.80
  6. Step 6: Final answer
    x = 418,922.40

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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.