Home / 21,639.60-29,861.76-13,142.64

Finding the Fourth Proportional to 21,639.60, 29,861.76 and 13,142.64

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Solution

The fourth proportional to 21,639.60, 29,861.76 and 13,142.64 is: 18,136.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,639.60 : 29,861.76 = 13,142.64 : x
  2. Step 2: Convert to fraction form
    21,639.60/29,861.76 = 13,142.64/x
  3. Step 3: Cross multiply
    21,639.60x = 29,861.76 × 13,142.64
  4. Step 4: Simplify right side
    21,639.60x = 392,462,361.45
  5. Step 5: Solve for x
    x = 392,462,361.45/21,639.60
  6. Step 6: Final answer
    x = 18,136.30

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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.