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Finding the Fourth Proportional to 217,226.40, 325,985.40 and 128,385.60

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Solution

The fourth proportional to 217,226.40, 325,985.40 and 128,385.60 is: 192,664.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,226.40 : 325,985.40 = 128,385.60 : x
  2. Step 2: Convert to fraction form
    217,226.40/325,985.40 = 128,385.60/x
  3. Step 3: Cross multiply
    217,226.40x = 325,985.40 × 128,385.60
  4. Step 4: Simplify right side
    217,226.40x = 41,851,831,170.24
  5. Step 5: Solve for x
    x = 41,851,831,170.24/217,226.40
  6. Step 6: Final answer
    x = 192,664.57

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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.