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Finding the Fourth Proportional to 20,673.60, 31,010.40 and 10,815.90

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Solution

The fourth proportional to 20,673.60, 31,010.40 and 10,815.90 is: 16,223.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,673.60 : 31,010.40 = 10,815.90 : x
  2. Step 2: Convert to fraction form
    20,673.60/31,010.40 = 10,815.90/x
  3. Step 3: Cross multiply
    20,673.60x = 31,010.40 × 10,815.90
  4. Step 4: Simplify right side
    20,673.60x = 335,405,385.36
  5. Step 5: Solve for x
    x = 335,405,385.36/20,673.60
  6. Step 6: Final answer
    x = 16,223.85

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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.