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Finding the Fourth Proportional to 521,870.80, 782,806.20 and 272,520.40

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Solution

The fourth proportional to 521,870.80, 782,806.20 and 272,520.40 is: 408,780.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,870.80 : 782,806.20 = 272,520.40 : x
  2. Step 2: Convert to fraction form
    521,870.80/782,806.20 = 272,520.40/x
  3. Step 3: Cross multiply
    521,870.80x = 782,806.20 × 272,520.40
  4. Step 4: Simplify right side
    521,870.80x = 213,330,658,746.48
  5. Step 5: Solve for x
    x = 213,330,658,746.48/521,870.80
  6. Step 6: Final answer
    x = 408,780.60

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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.