Home / 20,764.60-31,146.90-12,470.20

Finding the Fourth Proportional to 20,764.60, 31,146.90 and 12,470.20

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Solution

The fourth proportional to 20,764.60, 31,146.90 and 12,470.20 is: 18,705.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,764.60 : 31,146.90 = 12,470.20 : x
  2. Step 2: Convert to fraction form
    20,764.60/31,146.90 = 12,470.20/x
  3. Step 3: Cross multiply
    20,764.60x = 31,146.90 × 12,470.20
  4. Step 4: Simplify right side
    20,764.60x = 388,408,072.38
  5. Step 5: Solve for x
    x = 388,408,072.38/20,764.60
  6. Step 6: Final answer
    x = 18,705.30

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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.