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Finding the Fourth Proportional to 420,807.91, 580,718.62 and 239,531.51

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Solution

The fourth proportional to 420,807.91, 580,718.62 and 239,531.51 is: 330,555.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,807.91 : 580,718.62 = 239,531.51 : x
  2. Step 2: Convert to fraction form
    420,807.91/580,718.62 = 239,531.51/x
  3. Step 3: Cross multiply
    420,807.91x = 580,718.62 × 239,531.51
  4. Step 4: Simplify right side
    420,807.91x = 139,100,405,030.12
  5. Step 5: Solve for x
    x = 139,100,405,030.12/420,807.91
  6. Step 6: Final answer
    x = 330,555.59

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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.