Home / 420,961.86-631,448.19-140,479.11

Finding the Fourth Proportional to 420,961.86, 631,448.19 and 140,479.11

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Solution

The fourth proportional to 420,961.86, 631,448.19 and 140,479.11 is: 210,720.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,961.86 : 631,448.19 = 140,479.11 : x
  2. Step 2: Convert to fraction form
    420,961.86/631,448.19 = 140,479.11/x
  3. Step 3: Cross multiply
    420,961.86x = 631,448.19 × 140,479.11
  4. Step 4: Simplify right side
    420,961.86x = 88,705,279,742.31
  5. Step 5: Solve for x
    x = 88,705,279,742.31/420,961.86
  6. Step 6: Final answer
    x = 210,720.47

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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.