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Finding the Fourth Proportional to 172,129.80, 258,065.10 and 72,208.20

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Solution

The fourth proportional to 172,129.80, 258,065.10 and 72,208.20 is: 108,257.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,129.80 : 258,065.10 = 72,208.20 : x
  2. Step 2: Convert to fraction form
    172,129.80/258,065.10 = 72,208.20/x
  3. Step 3: Cross multiply
    172,129.80x = 258,065.10 × 72,208.20
  4. Step 4: Simplify right side
    172,129.80x = 18,634,416,353.82
  5. Step 5: Solve for x
    x = 18,634,416,353.82/172,129.80
  6. Step 6: Final answer
    x = 108,257.93

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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.