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Finding the Fourth Proportional to 426,620.29, 639,968.70 and 111,079.93

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Solution

The fourth proportional to 426,620.29, 639,968.70 and 111,079.93 is: 166,629.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,620.29 : 639,968.70 = 111,079.93 : x
  2. Step 2: Convert to fraction form
    426,620.29/639,968.70 = 111,079.93/x
  3. Step 3: Cross multiply
    426,620.29x = 639,968.70 × 111,079.93
  4. Step 4: Simplify right side
    426,620.29x = 71,087,678,398.19
  5. Step 5: Solve for x
    x = 71,087,678,398.19/426,620.29
  6. Step 6: Final answer
    x = 166,629.86

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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.