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Finding the Fourth Proportional to 398,777.28, 550,310.32 and 217,485.76

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Solution

The fourth proportional to 398,777.28, 550,310.32 and 217,485.76 is: 300,129.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,777.28 : 550,310.32 = 217,485.76 : x
  2. Step 2: Convert to fraction form
    398,777.28/550,310.32 = 217,485.76/x
  3. Step 3: Cross multiply
    398,777.28x = 550,310.32 × 217,485.76
  4. Step 4: Simplify right side
    398,777.28x = 119,684,658,181.04
  5. Step 5: Solve for x
    x = 119,684,658,181.04/398,777.28
  6. Step 6: Final answer
    x = 300,129.08

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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.