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Finding the Fourth Proportional to 20,957.42, 31,440.02 and 6,918.43

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Solution

The fourth proportional to 20,957.42, 31,440.02 and 6,918.43 is: 10,378.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.42 : 31,440.02 = 6,918.43 : x
  2. Step 2: Convert to fraction form
    20,957.42/31,440.02 = 6,918.43/x
  3. Step 3: Cross multiply
    20,957.42x = 31,440.02 × 6,918.43
  4. Step 4: Simplify right side
    20,957.42x = 217,515,464.38
  5. Step 5: Solve for x
    x = 217,515,464.38/20,957.42
  6. Step 6: Final answer
    x = 10,378.92

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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.