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Finding the Fourth Proportional to 438,422.40, 656,321.40 and 391,183.20

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Solution

The fourth proportional to 438,422.40, 656,321.40 and 391,183.20 is: 585,603.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,422.40 : 656,321.40 = 391,183.20 : x
  2. Step 2: Convert to fraction form
    438,422.40/656,321.40 = 391,183.20/x
  3. Step 3: Cross multiply
    438,422.40x = 656,321.40 × 391,183.20
  4. Step 4: Simplify right side
    438,422.40x = 256,741,905,480.48
  5. Step 5: Solve for x
    x = 256,741,905,480.48/438,422.40
  6. Step 6: Final answer
    x = 585,603.99

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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.