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Finding the Fourth Proportional to 306,351.60, 422,296.65 and 215,459.88

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Solution

The fourth proportional to 306,351.60, 422,296.65 and 215,459.88 is: 297,005.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,351.60 : 422,296.65 = 215,459.88 : x
  2. Step 2: Convert to fraction form
    306,351.60/422,296.65 = 215,459.88/x
  3. Step 3: Cross multiply
    306,351.60x = 422,296.65 × 215,459.88
  4. Step 4: Simplify right side
    306,351.60x = 90,987,985,533.40
  5. Step 5: Solve for x
    x = 90,987,985,533.40/306,351.60
  6. Step 6: Final answer
    x = 297,005.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.