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Finding the Fourth Proportional to 125,215, 172,796.70 and 72,223

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Solution

The fourth proportional to 125,215, 172,796.70 and 72,223 is: 99,667.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,215 : 172,796.70 = 72,223 : x
  2. Step 2: Convert to fraction form
    125,215/172,796.70 = 72,223/x
  3. Step 3: Cross multiply
    125,215x = 172,796.70 × 72,223
  4. Step 4: Simplify right side
    125,215x = 12,479,896,064.10
  5. Step 5: Solve for x
    x = 12,479,896,064.10/125,215
  6. Step 6: Final answer
    x = 99,667.74

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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.