Home / 20,818.40-31,238.40-9,132.80

Finding the Fourth Proportional to 20,818.40, 31,238.40 and 9,132.80

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Solution

The fourth proportional to 20,818.40, 31,238.40 and 9,132.80 is: 13,703.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.40 : 31,238.40 = 9,132.80 : x
  2. Step 2: Convert to fraction form
    20,818.40/31,238.40 = 9,132.80/x
  3. Step 3: Cross multiply
    20,818.40x = 31,238.40 × 9,132.80
  4. Step 4: Simplify right side
    20,818.40x = 285,294,059.52
  5. Step 5: Solve for x
    x = 285,294,059.52/20,818.40
  6. Step 6: Final answer
    x = 13,703.94

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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.