Home / 21,730.20-29,980.65-12,168.64

Finding the Fourth Proportional to 21,730.20, 29,980.65 and 12,168.64

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Solution

The fourth proportional to 21,730.20, 29,980.65 and 12,168.64 is: 16,788.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,730.20 : 29,980.65 = 12,168.64 : x
  2. Step 2: Convert to fraction form
    21,730.20/29,980.65 = 12,168.64/x
  3. Step 3: Cross multiply
    21,730.20x = 29,980.65 × 12,168.64
  4. Step 4: Simplify right side
    21,730.20x = 364,823,736.82
  5. Step 5: Solve for x
    x = 364,823,736.82/21,730.20
  6. Step 6: Final answer
    x = 16,788.79

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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.