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Finding the Fourth Proportional to 20,957.79, 31,440.59 and 6,918.80

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Solution

The fourth proportional to 20,957.79, 31,440.59 and 6,918.80 is: 10,379.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.79 : 31,440.59 = 6,918.80 : x
  2. Step 2: Convert to fraction form
    20,957.79/31,440.59 = 6,918.80/x
  3. Step 3: Cross multiply
    20,957.79x = 31,440.59 × 6,918.80
  4. Step 4: Simplify right side
    20,957.79x = 217,530,962.30
  5. Step 5: Solve for x
    x = 217,530,962.30/20,957.79
  6. Step 6: Final answer
    x = 10,379.48

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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.