Home / 421,409.12-631,981.91-140,860.76

Finding the Fourth Proportional to 421,409.12, 631,981.91 and 140,860.76

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Solution

The fourth proportional to 421,409.12, 631,981.91 and 140,860.76 is: 211,247.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,409.12 : 631,981.91 = 140,860.76 : x
  2. Step 2: Convert to fraction form
    421,409.12/631,981.91 = 140,860.76/x
  3. Step 3: Cross multiply
    421,409.12x = 631,981.91 × 140,860.76
  4. Step 4: Simplify right side
    421,409.12x = 89,021,449,341.09
  5. Step 5: Solve for x
    x = 89,021,449,341.09/421,409.12
  6. Step 6: Final answer
    x = 211,247.09

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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.