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Finding the Fourth Proportional to 306,440.80, 422,539.60 and 215,767.76

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Solution

The fourth proportional to 306,440.80, 422,539.60 and 215,767.76 is: 297,513.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,440.80 : 422,539.60 = 215,767.76 : x
  2. Step 2: Convert to fraction form
    306,440.80/422,539.60 = 215,767.76/x
  3. Step 3: Cross multiply
    306,440.80x = 422,539.60 × 215,767.76
  4. Step 4: Simplify right side
    306,440.80x = 91,170,423,003.30
  5. Step 5: Solve for x
    x = 91,170,423,003.30/306,440.80
  6. Step 6: Final answer
    x = 297,513.98

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1.5x scale

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.