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Finding the Fourth Proportional to 393,409.65, 589,969.89 and 140,621.92

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Solution

The fourth proportional to 393,409.65, 589,969.89 and 140,621.92 is: 210,881.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,409.65 : 589,969.89 = 140,621.92 : x
  2. Step 2: Convert to fraction form
    393,409.65/589,969.89 = 140,621.92/x
  3. Step 3: Cross multiply
    393,409.65x = 589,969.89 × 140,621.92
  4. Step 4: Simplify right side
    393,409.65x = 82,962,697,199.06
  5. Step 5: Solve for x
    x = 82,962,697,199.06/393,409.65
  6. Step 6: Final answer
    x = 210,881.20

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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.