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Finding the Fourth Proportional to 420,852.39, 631,367.24 and 136,520.74

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Solution

The fourth proportional to 420,852.39, 631,367.24 and 136,520.74 is: 204,809.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,852.39 : 631,367.24 = 136,520.74 : x
  2. Step 2: Convert to fraction form
    420,852.39/631,367.24 = 136,520.74/x
  3. Step 3: Cross multiply
    420,852.39x = 631,367.24 × 136,520.74
  4. Step 4: Simplify right side
    420,852.39x = 86,194,719,715.71
  5. Step 5: Solve for x
    x = 86,194,719,715.71/420,852.39
  6. Step 6: Final answer
    x = 204,809.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.