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Finding the Fourth Proportional to 420,650.32, 580,489.56 and 239,358.16

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Solution

The fourth proportional to 420,650.32, 580,489.56 and 239,358.16 is: 330,309.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,650.32 : 580,489.56 = 239,358.16 : x
  2. Step 2: Convert to fraction form
    420,650.32/580,489.56 = 239,358.16/x
  3. Step 3: Cross multiply
    420,650.32x = 580,489.56 × 239,358.16
  4. Step 4: Simplify right side
    420,650.32x = 138,944,912,980.81
  5. Step 5: Solve for x
    x = 138,944,912,980.81/420,650.32
  6. Step 6: Final answer
    x = 330,309.78

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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.