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Finding the Fourth Proportional to 217,156.60, 325,718.70 and 90,764.20

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Solution

The fourth proportional to 217,156.60, 325,718.70 and 90,764.20 is: 136,139.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,156.60 : 325,718.70 = 90,764.20 : x
  2. Step 2: Convert to fraction form
    217,156.60/325,718.70 = 90,764.20/x
  3. Step 3: Cross multiply
    217,156.60x = 325,718.70 × 90,764.20
  4. Step 4: Simplify right side
    217,156.60x = 29,563,597,230.54
  5. Step 5: Solve for x
    x = 29,563,597,230.54/217,156.60
  6. Step 6: Final answer
    x = 136,139.53

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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.