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Finding the Fourth Proportional to 125,211, 172,791.18 and 72,219

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Solution

The fourth proportional to 125,211, 172,791.18 and 72,219 is: 99,662.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,211 : 172,791.18 = 72,219 : x
  2. Step 2: Convert to fraction form
    125,211/172,791.18 = 72,219/x
  3. Step 3: Cross multiply
    125,211x = 172,791.18 × 72,219
  4. Step 4: Simplify right side
    125,211x = 12,478,806,228.42
  5. Step 5: Solve for x
    x = 12,478,806,228.42/125,211
  6. Step 6: Final answer
    x = 99,662.22

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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.