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Finding the Fourth Proportional to 521,640.60, 782,460.90 and 486,389.40

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Solution

The fourth proportional to 521,640.60, 782,460.90 and 486,389.40 is: 729,584.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,640.60 : 782,460.90 = 486,389.40 : x
  2. Step 2: Convert to fraction form
    521,640.60/782,460.90 = 486,389.40/x
  3. Step 3: Cross multiply
    521,640.60x = 782,460.90 × 486,389.40
  4. Step 4: Simplify right side
    521,640.60x = 380,580,687,674.46
  5. Step 5: Solve for x
    x = 380,580,687,674.46/521,640.60
  6. Step 6: Final answer
    x = 729,584.10

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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.