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Finding the Fourth Proportional to 820,609.60, 1,230,223.20 and 426,625.60

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Solution

The fourth proportional to 820,609.60, 1,230,223.20 and 426,625.60 is: 639,579.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,609.60 : 1,230,223.20 = 426,625.60 : x
  2. Step 2: Convert to fraction form
    820,609.60/1,230,223.20 = 426,625.60/x
  3. Step 3: Cross multiply
    820,609.60x = 1,230,223.20 × 426,625.60
  4. Step 4: Simplify right side
    820,609.60x = 524,844,710,833.92
  5. Step 5: Solve for x
    x = 524,844,710,833.92/820,609.60
  6. Step 6: Final answer
    x = 639,579.05

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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.