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Finding the Fourth Proportional to 261,087.20, 391,630.80 and 172,440.80

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Solution

The fourth proportional to 261,087.20, 391,630.80 and 172,440.80 is: 258,661.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,087.20 : 391,630.80 = 172,440.80 : x
  2. Step 2: Convert to fraction form
    261,087.20/391,630.80 = 172,440.80/x
  3. Step 3: Cross multiply
    261,087.20x = 391,630.80 × 172,440.80
  4. Step 4: Simplify right side
    261,087.20x = 67,533,128,456.64
  5. Step 5: Solve for x
    x = 67,533,128,456.64/261,087.20
  6. Step 6: Final answer
    x = 258,661.20

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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.