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Finding the Fourth Proportional to 519,864.80, 779,739.60 and 426,207.20

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Solution

The fourth proportional to 519,864.80, 779,739.60 and 426,207.20 is: 639,263.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,864.80 : 779,739.60 = 426,207.20 : x
  2. Step 2: Convert to fraction form
    519,864.80/779,739.60 = 426,207.20/x
  3. Step 3: Cross multiply
    519,864.80x = 779,739.60 × 426,207.20
  4. Step 4: Simplify right side
    519,864.80x = 332,330,631,645.12
  5. Step 5: Solve for x
    x = 332,330,631,645.12/519,864.80
  6. Step 6: Final answer
    x = 639,263.58

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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.