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Finding the Fourth Proportional to 418,912.25, 628,465.57 and 138,412.49

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Solution

The fourth proportional to 418,912.25, 628,465.57 and 138,412.49 is: 207,650.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,912.25 : 628,465.57 = 138,412.49 : x
  2. Step 2: Convert to fraction form
    418,912.25/628,465.57 = 138,412.49/x
  3. Step 3: Cross multiply
    418,912.25x = 628,465.57 × 138,412.49
  4. Step 4: Simplify right side
    418,912.25x = 86,987,480,934.61
  5. Step 5: Solve for x
    x = 86,987,480,934.61/418,912.25
  6. Step 6: Final answer
    x = 207,650.84

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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.