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Finding the Fourth Proportional to 20,670.60, 31,005.90 and 10,812.90

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Solution

The fourth proportional to 20,670.60, 31,005.90 and 10,812.90 is: 16,219.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,670.60 : 31,005.90 = 10,812.90 : x
  2. Step 2: Convert to fraction form
    20,670.60/31,005.90 = 10,812.90/x
  3. Step 3: Cross multiply
    20,670.60x = 31,005.90 × 10,812.90
  4. Step 4: Simplify right side
    20,670.60x = 335,263,696.11
  5. Step 5: Solve for x
    x = 335,263,696.11/20,670.60
  6. Step 6: Final answer
    x = 16,219.35

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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.