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Finding the Fourth Proportional to 520,199.40, 780,299.10 and 485,207.40

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Solution

The fourth proportional to 520,199.40, 780,299.10 and 485,207.40 is: 727,811.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,199.40 : 780,299.10 = 485,207.40 : x
  2. Step 2: Convert to fraction form
    520,199.40/780,299.10 = 485,207.40/x
  3. Step 3: Cross multiply
    520,199.40x = 780,299.10 × 485,207.40
  4. Step 4: Simplify right side
    520,199.40x = 378,606,897,533.34
  5. Step 5: Solve for x
    x = 378,606,897,533.34/520,199.40
  6. Step 6: Final answer
    x = 727,811.10

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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.