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Finding the Fourth Proportional to 139,630.80, 209,446.20 and 137,326.80

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Solution

The fourth proportional to 139,630.80, 209,446.20 and 137,326.80 is: 205,990.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,630.80 : 209,446.20 = 137,326.80 : x
  2. Step 2: Convert to fraction form
    139,630.80/209,446.20 = 137,326.80/x
  3. Step 3: Cross multiply
    139,630.80x = 209,446.20 × 137,326.80
  4. Step 4: Simplify right side
    139,630.80x = 28,762,576,418.16
  5. Step 5: Solve for x
    x = 28,762,576,418.16/139,630.80
  6. Step 6: Final answer
    x = 205,990.20

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1.5x scale

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.