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Finding the Fourth Proportional to 21,354.64, 29,466.60 and 11,921.68

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Solution

The fourth proportional to 21,354.64, 29,466.60 and 11,921.68 is: 16,450.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,354.64 : 29,466.60 = 11,921.68 : x
  2. Step 2: Convert to fraction form
    21,354.64/29,466.60 = 11,921.68/x
  3. Step 3: Cross multiply
    21,354.64x = 29,466.60 × 11,921.68
  4. Step 4: Simplify right side
    21,354.64x = 351,291,375.89
  5. Step 5: Solve for x
    x = 351,291,375.89/21,354.64
  6. Step 6: Final answer
    x = 16,450.35

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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.