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Finding the Fourth Proportional to 418,967.96, 628,550.37 and 138,485.21

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Solution

The fourth proportional to 418,967.96, 628,550.37 and 138,485.21 is: 207,760.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,967.96 : 628,550.37 = 138,485.21 : x
  2. Step 2: Convert to fraction form
    418,967.96/628,550.37 = 138,485.21/x
  3. Step 3: Cross multiply
    418,967.96x = 628,550.37 × 138,485.21
  4. Step 4: Simplify right side
    418,967.96x = 87,044,929,985.03
  5. Step 5: Solve for x
    x = 87,044,929,985.03/418,967.96
  6. Step 6: Final answer
    x = 207,760.35

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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.