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Finding the Fourth Proportional to 261,189, 391,783.44 and 172,421.72

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Solution

The fourth proportional to 261,189, 391,783.44 and 172,421.72 is: 258,632.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,189 : 391,783.44 = 172,421.72 : x
  2. Step 2: Convert to fraction form
    261,189/391,783.44 = 172,421.72/x
  3. Step 3: Cross multiply
    261,189x = 391,783.44 × 172,421.72
  4. Step 4: Simplify right side
    261,189x = 67,551,974,592.32
  5. Step 5: Solve for x
    x = 67,551,974,592.32/261,189
  6. Step 6: Final answer
    x = 258,632.54

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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.