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Finding the Fourth Proportional to 426,043.80, 639,065.70 and 126,570.60

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Solution

The fourth proportional to 426,043.80, 639,065.70 and 126,570.60 is: 189,855.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,043.80 : 639,065.70 = 126,570.60 : x
  2. Step 2: Convert to fraction form
    426,043.80/639,065.70 = 126,570.60/x
  3. Step 3: Cross multiply
    426,043.80x = 639,065.70 × 126,570.60
  4. Step 4: Simplify right side
    426,043.80x = 80,886,929,088.42
  5. Step 5: Solve for x
    x = 80,886,929,088.42/426,043.80
  6. Step 6: Final answer
    x = 189,855.90

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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.