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Finding the Fourth Proportional to 418,979.74, 628,568.01 and 138,496.98

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Solution

The fourth proportional to 418,979.74, 628,568.01 and 138,496.98 is: 207,778.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,979.74 : 628,568.01 = 138,496.98 : x
  2. Step 2: Convert to fraction form
    418,979.74/628,568.01 = 138,496.98/x
  3. Step 3: Cross multiply
    418,979.74x = 628,568.01 × 138,496.98
  4. Step 4: Simplify right side
    418,979.74x = 87,054,771,109.61
  5. Step 5: Solve for x
    x = 87,054,771,109.61/418,979.74
  6. Step 6: Final answer
    x = 207,778.00

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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.