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Finding the Fourth Proportional to 426,148.61, 639,112.34 and 126,558.77

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Solution

The fourth proportional to 426,148.61, 639,112.34 and 126,558.77 is: 189,805.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,148.61 : 639,112.34 = 126,558.77 : x
  2. Step 2: Convert to fraction form
    426,148.61/639,112.34 = 126,558.77/x
  3. Step 3: Cross multiply
    426,148.61x = 639,112.34 × 126,558.77
  4. Step 4: Simplify right side
    426,148.61x = 80,885,268,763.06
  5. Step 5: Solve for x
    x = 80,885,268,763.06/426,148.61
  6. Step 6: Final answer
    x = 189,805.31

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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.