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Finding the Fourth Proportional to 14,128.70, 21,180.90 and 7,203.20

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Solution

The fourth proportional to 14,128.70, 21,180.90 and 7,203.20 is: 10,798.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,128.70 : 21,180.90 = 7,203.20 : x
  2. Step 2: Convert to fraction form
    14,128.70/21,180.90 = 7,203.20/x
  3. Step 3: Cross multiply
    14,128.70x = 21,180.90 × 7,203.20
  4. Step 4: Simplify right side
    14,128.70x = 152,570,258.88
  5. Step 5: Solve for x
    x = 152,570,258.88/14,128.70
  6. Step 6: Final answer
    x = 10,798.61

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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.