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Finding the Fourth Proportional to 217,090.40, 325,635.60 and 128,298.20

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Solution

The fourth proportional to 217,090.40, 325,635.60 and 128,298.20 is: 192,447.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,090.40 : 325,635.60 = 128,298.20 : x
  2. Step 2: Convert to fraction form
    217,090.40/325,635.60 = 128,298.20/x
  3. Step 3: Cross multiply
    217,090.40x = 325,635.60 × 128,298.20
  4. Step 4: Simplify right side
    217,090.40x = 41,778,461,335.92
  5. Step 5: Solve for x
    x = 41,778,461,335.92/217,090.40
  6. Step 6: Final answer
    x = 192,447.30

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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.