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Finding the Fourth Proportional to 20,941.20, 31,411.80 and 7,090.20

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Solution

The fourth proportional to 20,941.20, 31,411.80 and 7,090.20 is: 10,635.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,941.20 : 31,411.80 = 7,090.20 : x
  2. Step 2: Convert to fraction form
    20,941.20/31,411.80 = 7,090.20/x
  3. Step 3: Cross multiply
    20,941.20x = 31,411.80 × 7,090.20
  4. Step 4: Simplify right side
    20,941.20x = 222,715,944.36
  5. Step 5: Solve for x
    x = 222,715,944.36/20,941.20
  6. Step 6: Final answer
    x = 10,635.30

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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.