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Finding the Fourth Proportional to 20,906.60, 31,359.90 and 7,055.40

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Solution

The fourth proportional to 20,906.60, 31,359.90 and 7,055.40 is: 10,583.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,906.60 : 31,359.90 = 7,055.40 : x
  2. Step 2: Convert to fraction form
    20,906.60/31,359.90 = 7,055.40/x
  3. Step 3: Cross multiply
    20,906.60x = 31,359.90 × 7,055.40
  4. Step 4: Simplify right side
    20,906.60x = 221,256,638.46
  5. Step 5: Solve for x
    x = 221,256,638.46/20,906.60
  6. Step 6: Final answer
    x = 10,583.10

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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.