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Finding the Fourth Proportional to 415,187.20, 621,859.20 and 165,740.80

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Solution

The fourth proportional to 415,187.20, 621,859.20 and 165,740.80 is: 248,243.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,187.20 : 621,859.20 = 165,740.80 : x
  2. Step 2: Convert to fraction form
    415,187.20/621,859.20 = 165,740.80/x
  3. Step 3: Cross multiply
    415,187.20x = 621,859.20 × 165,740.80
  4. Step 4: Simplify right side
    415,187.20x = 103,067,441,295.36
  5. Step 5: Solve for x
    x = 103,067,441,295.36/415,187.20
  6. Step 6: Final answer
    x = 248,243.30

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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.