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Finding the Fourth Proportional to 609,269.40, 913,904.10 and 431,976.60

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Solution

The fourth proportional to 609,269.40, 913,904.10 and 431,976.60 is: 647,964.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    609,269.40 : 913,904.10 = 431,976.60 : x
  2. Step 2: Convert to fraction form
    609,269.40/913,904.10 = 431,976.60/x
  3. Step 3: Cross multiply
    609,269.40x = 913,904.10 × 431,976.60
  4. Step 4: Simplify right side
    609,269.40x = 394,785,185,844.06
  5. Step 5: Solve for x
    x = 394,785,185,844.06/609,269.40
  6. Step 6: Final answer
    x = 647,964.90

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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.