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Finding the Fourth Proportional to 20,815.60, 31,223.40 and 20,815.60

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Solution

The fourth proportional to 20,815.60, 31,223.40 and 20,815.60 is: 31,223.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.60 : 31,223.40 = 20,815.60 : x
  2. Step 2: Convert to fraction form
    20,815.60/31,223.40 = 20,815.60/x
  3. Step 3: Cross multiply
    20,815.60x = 31,223.40 × 20,815.60
  4. Step 4: Simplify right side
    20,815.60x = 649,933,805.04
  5. Step 5: Solve for x
    x = 649,933,805.04/20,815.60
  6. Step 6: Final answer
    x = 31,223.40

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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.