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Finding the Fourth Proportional to 425,640.40, 638,136.60 and 215,429.20

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Solution

The fourth proportional to 425,640.40, 638,136.60 and 215,429.20 is: 322,979.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,640.40 : 638,136.60 = 215,429.20 : x
  2. Step 2: Convert to fraction form
    425,640.40/638,136.60 = 215,429.20/x
  3. Step 3: Cross multiply
    425,640.40x = 638,136.60 × 215,429.20
  4. Step 4: Simplify right side
    425,640.40x = 137,473,257,228.72
  5. Step 5: Solve for x
    x = 137,473,257,228.72/425,640.40
  6. Step 6: Final answer
    x = 322,979.81

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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.