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Finding the Fourth Proportional to 20,720.80, 31,044.60 and 20,035.60

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Solution

The fourth proportional to 20,720.80, 31,044.60 and 20,035.60 is: 30,018.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.80 : 31,044.60 = 20,035.60 : x
  2. Step 2: Convert to fraction form
    20,720.80/31,044.60 = 20,035.60/x
  3. Step 3: Cross multiply
    20,720.80x = 31,044.60 × 20,035.60
  4. Step 4: Simplify right side
    20,720.80x = 621,997,187.76
  5. Step 5: Solve for x
    x = 621,997,187.76/20,720.80
  6. Step 6: Final answer
    x = 30,018.01

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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.