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Finding the Fourth Proportional to 125,213, 172,793.94 and 72,221

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Solution

The fourth proportional to 125,213, 172,793.94 and 72,221 is: 99,664.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,213 : 172,793.94 = 72,221 : x
  2. Step 2: Convert to fraction form
    125,213/172,793.94 = 72,221/x
  3. Step 3: Cross multiply
    125,213x = 172,793.94 × 72,221
  4. Step 4: Simplify right side
    125,213x = 12,479,351,140.74
  5. Step 5: Solve for x
    x = 12,479,351,140.74/125,213
  6. Step 6: Final answer
    x = 99,664.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.