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Finding the Fourth Proportional to 521,186.40, 781,779.60 and 320,857.20

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Solution

The fourth proportional to 521,186.40, 781,779.60 and 320,857.20 is: 481,285.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,186.40 : 781,779.60 = 320,857.20 : x
  2. Step 2: Convert to fraction form
    521,186.40/781,779.60 = 320,857.20/x
  3. Step 3: Cross multiply
    521,186.40x = 781,779.60 × 320,857.20
  4. Step 4: Simplify right side
    521,186.40x = 250,839,613,473.12
  5. Step 5: Solve for x
    x = 250,839,613,473.12/521,186.40
  6. Step 6: Final answer
    x = 481,285.80

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Similar ratio
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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.