Home / 261,538.40-391,782.48-221,385.44

Finding the Fourth Proportional to 261,538.40, 391,782.48 and 221,385.44

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Solution

The fourth proportional to 261,538.40, 391,782.48 and 221,385.44 is: 331,633.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,538.40 : 391,782.48 = 221,385.44 : x
  2. Step 2: Convert to fraction form
    261,538.40/391,782.48 = 221,385.44/x
  3. Step 3: Cross multiply
    261,538.40x = 391,782.48 × 221,385.44
  4. Step 4: Simplify right side
    261,538.40x = 86,734,936,719.09
  5. Step 5: Solve for x
    x = 86,734,936,719.09/261,538.40
  6. Step 6: Final answer
    x = 331,633.66

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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.