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Finding the Fourth Proportional to 418,971.46, 628,555.62 and 138,488.71

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Solution

The fourth proportional to 418,971.46, 628,555.62 and 138,488.71 is: 207,765.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,971.46 : 628,555.62 = 138,488.71 : x
  2. Step 2: Convert to fraction form
    418,971.46/628,555.62 = 138,488.71/x
  3. Step 3: Cross multiply
    418,971.46x = 628,555.62 × 138,488.71
  4. Step 4: Simplify right side
    418,971.46x = 87,047,856,977.05
  5. Step 5: Solve for x
    x = 87,047,856,977.05/418,971.46
  6. Step 6: Final answer
    x = 207,765.60

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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.