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Finding the Fourth Proportional to 420,608.30, 580,419.20 and 239,303.30

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Solution

The fourth proportional to 420,608.30, 580,419.20 and 239,303.30 is: 330,227.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,608.30 : 580,419.20 = 239,303.30 : x
  2. Step 2: Convert to fraction form
    420,608.30/580,419.20 = 239,303.30/x
  3. Step 3: Cross multiply
    420,608.30x = 580,419.20 × 239,303.30
  4. Step 4: Simplify right side
    420,608.30x = 138,896,227,639.52
  5. Step 5: Solve for x
    x = 138,896,227,639.52/420,608.30
  6. Step 6: Final answer
    x = 330,227.03

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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.