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Finding the Fourth Proportional to 565,387.39, 780,201.60 and 310,738.78

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Solution

The fourth proportional to 565,387.39, 780,201.60 and 310,738.78 is: 428,801.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    565,387.39 : 780,201.60 = 310,738.78 : x
  2. Step 2: Convert to fraction form
    565,387.39/780,201.60 = 310,738.78/x
  3. Step 3: Cross multiply
    565,387.39x = 780,201.60 × 310,738.78
  4. Step 4: Simplify right side
    565,387.39x = 242,438,893,338.05
  5. Step 5: Solve for x
    x = 242,438,893,338.05/565,387.39
  6. Step 6: Final answer
    x = 428,801.38

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.