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Finding the Fourth Proportional to 207,690.60, 311,519.70 and 81,306.30

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Solution

The fourth proportional to 207,690.60, 311,519.70 and 81,306.30 is: 121,953.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,690.60 : 311,519.70 = 81,306.30 : x
  2. Step 2: Convert to fraction form
    207,690.60/311,519.70 = 81,306.30/x
  3. Step 3: Cross multiply
    207,690.60x = 311,519.70 × 81,306.30
  4. Step 4: Simplify right side
    207,690.60x = 25,328,514,184.11
  5. Step 5: Solve for x
    x = 25,328,514,184.11/207,690.60
  6. Step 6: Final answer
    x = 121,953.11

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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.