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Finding the Fourth Proportional to 21,080.40, 29,090.72 and 11,648.40

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Solution

The fourth proportional to 21,080.40, 29,090.72 and 11,648.40 is: 16,074.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,080.40 : 29,090.72 = 11,648.40 : x
  2. Step 2: Convert to fraction form
    21,080.40/29,090.72 = 11,648.40/x
  3. Step 3: Cross multiply
    21,080.40x = 29,090.72 × 11,648.40
  4. Step 4: Simplify right side
    21,080.40x = 338,860,342.85
  5. Step 5: Solve for x
    x = 338,860,342.85/21,080.40
  6. Step 6: Final answer
    x = 16,074.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.