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Finding the Fourth Proportional to 172,611.18, 258,585 and 105,856.62

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Solution

The fourth proportional to 172,611.18, 258,585 and 105,856.62 is: 158,581.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,611.18 : 258,585 = 105,856.62 : x
  2. Step 2: Convert to fraction form
    172,611.18/258,585 = 105,856.62/x
  3. Step 3: Cross multiply
    172,611.18x = 258,585 × 105,856.62
  4. Step 4: Simplify right side
    172,611.18x = 27,372,934,082.70
  5. Step 5: Solve for x
    x = 27,372,934,082.70/172,611.18
  6. Step 6: Final answer
    x = 158,581.47

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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.