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Finding the Fourth Proportional to 38,128.40, 57,203.40 and 11,835.80

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Solution

The fourth proportional to 38,128.40, 57,203.40 and 11,835.80 is: 17,757.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,128.40 : 57,203.40 = 11,835.80 : x
  2. Step 2: Convert to fraction form
    38,128.40/57,203.40 = 11,835.80/x
  3. Step 3: Cross multiply
    38,128.40x = 57,203.40 × 11,835.80
  4. Step 4: Simplify right side
    38,128.40x = 677,048,001.72
  5. Step 5: Solve for x
    x = 677,048,001.72/38,128.40
  6. Step 6: Final answer
    x = 17,757.05

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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.