Home / 428,247.14-642,321.02-112,728.65

Finding the Fourth Proportional to 428,247.14, 642,321.02 and 112,728.65

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Solution

The fourth proportional to 428,247.14, 642,321.02 and 112,728.65 is: 169,079.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,247.14 : 642,321.02 = 112,728.65 : x
  2. Step 2: Convert to fraction form
    428,247.14/642,321.02 = 112,728.65/x
  3. Step 3: Cross multiply
    428,247.14x = 642,321.02 × 112,728.65
  4. Step 4: Simplify right side
    428,247.14x = 72,407,978,521.44
  5. Step 5: Solve for x
    x = 72,407,978,521.44/428,247.14
  6. Step 6: Final answer
    x = 169,079.89

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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.