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Finding the Fourth Proportional to 426,267.20, 639,919.20 and 320,254.40

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Solution

The fourth proportional to 426,267.20, 639,919.20 and 320,254.40 is: 480,771.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,267.20 : 639,919.20 = 320,254.40 : x
  2. Step 2: Convert to fraction form
    426,267.20/639,919.20 = 320,254.40/x
  3. Step 3: Cross multiply
    426,267.20x = 639,919.20 × 320,254.40
  4. Step 4: Simplify right side
    426,267.20x = 204,936,939,444.48
  5. Step 5: Solve for x
    x = 204,936,939,444.48/426,267.20
  6. Step 6: Final answer
    x = 480,771.07

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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.