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Finding the Fourth Proportional to 137,997.20, 206,995.80 and 85,509.20

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Solution

The fourth proportional to 137,997.20, 206,995.80 and 85,509.20 is: 128,263.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,997.20 : 206,995.80 = 85,509.20 : x
  2. Step 2: Convert to fraction form
    137,997.20/206,995.80 = 85,509.20/x
  3. Step 3: Cross multiply
    137,997.20x = 206,995.80 × 85,509.20
  4. Step 4: Simplify right side
    137,997.20x = 17,700,045,261.36
  5. Step 5: Solve for x
    x = 17,700,045,261.36/137,997.20
  6. Step 6: Final answer
    x = 128,263.80

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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.