Home / 428,923.81-642,967.32-204,223.87

Finding the Fourth Proportional to 428,923.81, 642,967.32 and 204,223.87

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Solution

The fourth proportional to 428,923.81, 642,967.32 and 204,223.87 is: 306,136.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,923.81 : 642,967.32 = 204,223.87 : x
  2. Step 2: Convert to fraction form
    428,923.81/642,967.32 = 204,223.87/x
  3. Step 3: Cross multiply
    428,923.81x = 642,967.32 × 204,223.87
  4. Step 4: Simplify right side
    428,923.81x = 131,309,271,159.09
  5. Step 5: Solve for x
    x = 131,309,271,159.09/428,923.81
  6. Step 6: Final answer
    x = 306,136.59

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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.