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Finding the Fourth Proportional to 137,909.80, 206,864.70 and 90,670.60

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Solution

The fourth proportional to 137,909.80, 206,864.70 and 90,670.60 is: 136,005.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,909.80 : 206,864.70 = 90,670.60 : x
  2. Step 2: Convert to fraction form
    137,909.80/206,864.70 = 90,670.60/x
  3. Step 3: Cross multiply
    137,909.80x = 206,864.70 × 90,670.60
  4. Step 4: Simplify right side
    137,909.80x = 18,756,546,467.82
  5. Step 5: Solve for x
    x = 18,756,546,467.82/137,909.80
  6. Step 6: Final answer
    x = 136,005.90

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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.