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Finding the Fourth Proportional to 20,130.80, 30,215.40 and 17,212.40

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Solution

The fourth proportional to 20,130.80, 30,215.40 and 17,212.40 is: 25,835.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.80 : 30,215.40 = 17,212.40 : x
  2. Step 2: Convert to fraction form
    20,130.80/30,215.40 = 17,212.40/x
  3. Step 3: Cross multiply
    20,130.80x = 30,215.40 × 17,212.40
  4. Step 4: Simplify right side
    20,130.80x = 520,079,550.96
  5. Step 5: Solve for x
    x = 520,079,550.96/20,130.80
  6. Step 6: Final answer
    x = 25,835.02

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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.