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Finding the Fourth Proportional to 217,221.90, 325,832.85 and 99,123.90

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Solution

The fourth proportional to 217,221.90, 325,832.85 and 99,123.90 is: 148,685.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,221.90 : 325,832.85 = 99,123.90 : x
  2. Step 2: Convert to fraction form
    217,221.90/325,832.85 = 99,123.90/x
  3. Step 3: Cross multiply
    217,221.90x = 325,832.85 × 99,123.90
  4. Step 4: Simplify right side
    217,221.90x = 32,297,822,840.12
  5. Step 5: Solve for x
    x = 32,297,822,840.12/217,221.90
  6. Step 6: Final answer
    x = 148,685.85

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1.5x scale

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.