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Finding the Fourth Proportional to 217,219.40, 325,829.10 and 128,427.20

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Solution

The fourth proportional to 217,219.40, 325,829.10 and 128,427.20 is: 192,640.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,219.40 : 325,829.10 = 128,427.20 : x
  2. Step 2: Convert to fraction form
    217,219.40/325,829.10 = 128,427.20/x
  3. Step 3: Cross multiply
    217,219.40x = 325,829.10 × 128,427.20
  4. Step 4: Simplify right side
    217,219.40x = 41,845,318,991.52
  5. Step 5: Solve for x
    x = 41,845,318,991.52/217,219.40
  6. Step 6: Final answer
    x = 192,640.80

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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.