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Finding the Fourth Proportional to 426,374.55, 639,450.45 and 126,774.45

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Solution

The fourth proportional to 426,374.55, 639,450.45 and 126,774.45 is: 190,128.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,374.55 : 639,450.45 = 126,774.45 : x
  2. Step 2: Convert to fraction form
    426,374.55/639,450.45 = 126,774.45/x
  3. Step 3: Cross multiply
    426,374.55x = 639,450.45 × 126,774.45
  4. Step 4: Simplify right side
    426,374.55x = 81,065,979,101.00
  5. Step 5: Solve for x
    x = 81,065,979,101.00/426,374.55
  6. Step 6: Final answer
    x = 190,128.56

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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.