Home / 420,764.21-631,146.32-105,221.12

Finding the Fourth Proportional to 420,764.21, 631,146.32 and 105,221.12

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Solution

The fourth proportional to 420,764.21, 631,146.32 and 105,221.12 is: 157,831.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,764.21 : 631,146.32 = 105,221.12 : x
  2. Step 2: Convert to fraction form
    420,764.21/631,146.32 = 105,221.12/x
  3. Step 3: Cross multiply
    420,764.21x = 631,146.32 × 105,221.12
  4. Step 4: Simplify right side
    420,764.21x = 66,409,924,515.20
  5. Step 5: Solve for x
    x = 66,409,924,515.20/420,764.21
  6. Step 6: Final answer
    x = 157,831.68

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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.