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Finding the Fourth Proportional to 439,627.70, 659,441.55 and 387,139.70

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Solution

The fourth proportional to 439,627.70, 659,441.55 and 387,139.70 is: 580,709.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,627.70 : 659,441.55 = 387,139.70 : x
  2. Step 2: Convert to fraction form
    439,627.70/659,441.55 = 387,139.70/x
  3. Step 3: Cross multiply
    439,627.70x = 659,441.55 × 387,139.70
  4. Step 4: Simplify right side
    439,627.70x = 255,296,003,834.54
  5. Step 5: Solve for x
    x = 255,296,003,834.54/439,627.70
  6. Step 6: Final answer
    x = 580,709.55

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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.