Home / 21,137.86-29,150.11-12,638.60

Finding the Fourth Proportional to 21,137.86, 29,150.11 and 12,638.60

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Solution

The fourth proportional to 21,137.86, 29,150.11 and 12,638.60 is: 17,429.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.86 : 29,150.11 = 12,638.60 : x
  2. Step 2: Convert to fraction form
    21,137.86/29,150.11 = 12,638.60/x
  3. Step 3: Cross multiply
    21,137.86x = 29,150.11 × 12,638.60
  4. Step 4: Simplify right side
    21,137.86x = 368,416,506.29
  5. Step 5: Solve for x
    x = 368,416,506.29/21,137.86
  6. Step 6: Final answer
    x = 17,429.23

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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.