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Finding the Fourth Proportional to 40,663.80, 60,995.70 and 20,980.80

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Solution

The fourth proportional to 40,663.80, 60,995.70 and 20,980.80 is: 31,471.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,663.80 : 60,995.70 = 20,980.80 : x
  2. Step 2: Convert to fraction form
    40,663.80/60,995.70 = 20,980.80/x
  3. Step 3: Cross multiply
    40,663.80x = 60,995.70 × 20,980.80
  4. Step 4: Simplify right side
    40,663.80x = 1,279,738,582.56
  5. Step 5: Solve for x
    x = 1,279,738,582.56/40,663.80
  6. Step 6: Final answer
    x = 31,471.20

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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.