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Finding the Fourth Proportional to 137,986.80, 206,980.20 and 39,490.80

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Solution

The fourth proportional to 137,986.80, 206,980.20 and 39,490.80 is: 59,236.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,986.80 : 206,980.20 = 39,490.80 : x
  2. Step 2: Convert to fraction form
    137,986.80/206,980.20 = 39,490.80/x
  3. Step 3: Cross multiply
    137,986.80x = 206,980.20 × 39,490.80
  4. Step 4: Simplify right side
    137,986.80x = 8,173,813,682.16
  5. Step 5: Solve for x
    x = 8,173,813,682.16/137,986.80
  6. Step 6: Final answer
    x = 59,236.20

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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.