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Finding the Fourth Proportional to 520,086.30, 780,129.45 and 220,515.90

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Solution

The fourth proportional to 520,086.30, 780,129.45 and 220,515.90 is: 330,773.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,086.30 : 780,129.45 = 220,515.90 : x
  2. Step 2: Convert to fraction form
    520,086.30/780,129.45 = 220,515.90/x
  3. Step 3: Cross multiply
    520,086.30x = 780,129.45 × 220,515.90
  4. Step 4: Simplify right side
    520,086.30x = 172,030,947,783.26
  5. Step 5: Solve for x
    x = 172,030,947,783.26/520,086.30
  6. Step 6: Final answer
    x = 330,773.85

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Double scale
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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.