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Finding the Fourth Proportional to 622,812.40, 934,218.60 and 398,426.20

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Solution

The fourth proportional to 622,812.40, 934,218.60 and 398,426.20 is: 597,639.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    622,812.40 : 934,218.60 = 398,426.20 : x
  2. Step 2: Convert to fraction form
    622,812.40/934,218.60 = 398,426.20/x
  3. Step 3: Cross multiply
    622,812.40x = 934,218.60 × 398,426.20
  4. Step 4: Simplify right side
    622,812.40x = 372,217,166,767.32
  5. Step 5: Solve for x
    x = 372,217,166,767.32/622,812.40
  6. Step 6: Final answer
    x = 597,639.30

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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.