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Finding the Fourth Proportional to 217,308.60, 325,853.55 and 128,589.30

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Solution

The fourth proportional to 217,308.60, 325,853.55 and 128,589.30 is: 192,819.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,308.60 : 325,853.55 = 128,589.30 : x
  2. Step 2: Convert to fraction form
    217,308.60/325,853.55 = 128,589.30/x
  3. Step 3: Cross multiply
    217,308.60x = 325,853.55 × 128,589.30
  4. Step 4: Simplify right side
    217,308.60x = 41,901,279,897.02
  5. Step 5: Solve for x
    x = 41,901,279,897.02/217,308.60
  6. Step 6: Final answer
    x = 192,819.24

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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.