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Finding the Fourth Proportional to 622,814.40, 934,221.60 and 398,428.20

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Solution

The fourth proportional to 622,814.40, 934,221.60 and 398,428.20 is: 597,642.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    622,814.40 : 934,221.60 = 398,428.20 : x
  2. Step 2: Convert to fraction form
    622,814.40/934,221.60 = 398,428.20/x
  3. Step 3: Cross multiply
    622,814.40x = 934,221.60 × 398,428.20
  4. Step 4: Simplify right side
    622,814.40x = 372,220,230,489.12
  5. Step 5: Solve for x
    x = 372,220,230,489.12/622,814.40
  6. Step 6: Final answer
    x = 597,642.30

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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.