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Finding the Fourth Proportional to 520,086.40, 780,129.60 and 415,110.40

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Solution

The fourth proportional to 520,086.40, 780,129.60 and 415,110.40 is: 622,665.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,086.40 : 780,129.60 = 415,110.40 : x
  2. Step 2: Convert to fraction form
    520,086.40/780,129.60 = 415,110.40/x
  3. Step 3: Cross multiply
    520,086.40x = 780,129.60 × 415,110.40
  4. Step 4: Simplify right side
    520,086.40x = 323,839,910,307.84
  5. Step 5: Solve for x
    x = 323,839,910,307.84/520,086.40
  6. Step 6: Final answer
    x = 622,665.60

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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.