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Finding the Fourth Proportional to 520,412.80, 780,910.80 and 220,842.40

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Solution

The fourth proportional to 520,412.80, 780,910.80 and 220,842.40 is: 331,387.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,412.80 : 780,910.80 = 220,842.40 : x
  2. Step 2: Convert to fraction form
    520,412.80/780,910.80 = 220,842.40/x
  3. Step 3: Cross multiply
    520,412.80x = 780,910.80 × 220,842.40
  4. Step 4: Simplify right side
    520,412.80x = 172,458,215,257.92
  5. Step 5: Solve for x
    x = 172,458,215,257.92/520,412.80
  6. Step 6: Final answer
    x = 331,387.34

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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.