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Finding the Fourth Proportional to 418,968.96, 628,551.87 and 138,486.21

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Solution

The fourth proportional to 418,968.96, 628,551.87 and 138,486.21 is: 207,761.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,968.96 : 628,551.87 = 138,486.21 : x
  2. Step 2: Convert to fraction form
    418,968.96/628,551.87 = 138,486.21/x
  3. Step 3: Cross multiply
    418,968.96x = 628,551.87 × 138,486.21
  4. Step 4: Simplify right side
    418,968.96x = 87,045,766,264.71
  5. Step 5: Solve for x
    x = 87,045,766,264.71/418,968.96
  6. Step 6: Final answer
    x = 207,761.85

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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.