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Finding the Fourth Proportional to 399,210.76, 550,912.16 and 217,926.68

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Solution

The fourth proportional to 399,210.76, 550,912.16 and 217,926.68 is: 300,739.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,210.76 : 550,912.16 = 217,926.68 : x
  2. Step 2: Convert to fraction form
    399,210.76/550,912.16 = 217,926.68/x
  3. Step 3: Cross multiply
    399,210.76x = 550,912.16 × 217,926.68
  4. Step 4: Simplify right side
    399,210.76x = 120,058,458,000.43
  5. Step 5: Solve for x
    x = 120,058,458,000.43/399,210.76
  6. Step 6: Final answer
    x = 300,739.53

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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.