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Finding the Fourth Proportional to 520,460.70, 780,107.85 and 220,890.30

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Solution

The fourth proportional to 520,460.70, 780,107.85 and 220,890.30 is: 331,087.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,460.70 : 780,107.85 = 220,890.30 : x
  2. Step 2: Convert to fraction form
    520,460.70/780,107.85 = 220,890.30/x
  3. Step 3: Cross multiply
    520,460.70x = 780,107.85 × 220,890.30
  4. Step 4: Simplify right side
    520,460.70x = 172,318,257,018.86
  5. Step 5: Solve for x
    x = 172,318,257,018.86/520,460.70
  6. Step 6: Final answer
    x = 331,087.93

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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.