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Finding the Fourth Proportional to 261,187, 391,780.44 and 172,419.72

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Solution

The fourth proportional to 261,187, 391,780.44 and 172,419.72 is: 258,629.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,187 : 391,780.44 = 172,419.72 : x
  2. Step 2: Convert to fraction form
    261,187/391,780.44 = 172,419.72/x
  3. Step 3: Cross multiply
    261,187x = 391,780.44 × 172,419.72
  4. Step 4: Simplify right side
    261,187x = 67,550,673,766.28
  5. Step 5: Solve for x
    x = 67,550,673,766.28/261,187
  6. Step 6: Final answer
    x = 258,629.54

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1.5x scale

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.