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Finding the Fourth Proportional to 423,436.33, 635,093.20 and 139,138.08

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Solution

The fourth proportional to 423,436.33, 635,093.20 and 139,138.08 is: 208,686.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,436.33 : 635,093.20 = 139,138.08 : x
  2. Step 2: Convert to fraction form
    423,436.33/635,093.20 = 139,138.08/x
  3. Step 3: Cross multiply
    423,436.33x = 635,093.20 × 139,138.08
  4. Step 4: Simplify right side
    423,436.33x = 88,365,648,469.06
  5. Step 5: Solve for x
    x = 88,365,648,469.06/423,436.33
  6. Step 6: Final answer
    x = 208,686.98

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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.