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Finding the Fourth Proportional to 520,091.40, 780,137.10 and 415,115.40

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Solution

The fourth proportional to 520,091.40, 780,137.10 and 415,115.40 is: 622,673.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,091.40 : 780,137.10 = 415,115.40 : x
  2. Step 2: Convert to fraction form
    520,091.40/780,137.10 = 415,115.40/x
  3. Step 3: Cross multiply
    520,091.40x = 780,137.10 × 415,115.40
  4. Step 4: Simplify right side
    520,091.40x = 323,846,924,321.34
  5. Step 5: Solve for x
    x = 323,846,924,321.34/520,091.40
  6. Step 6: Final answer
    x = 622,673.10

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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.