Home / 12,949.29-19,431.63-12,129.30

Finding the Fourth Proportional to 12,949.29, 19,431.63 and 12,129.30

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Solution

The fourth proportional to 12,949.29, 19,431.63 and 12,129.30 is: 18,201.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,949.29 : 19,431.63 = 12,129.30 : x
  2. Step 2: Convert to fraction form
    12,949.29/19,431.63 = 12,129.30/x
  3. Step 3: Cross multiply
    12,949.29x = 19,431.63 × 12,129.30
  4. Step 4: Simplify right side
    12,949.29x = 235,692,069.76
  5. Step 5: Solve for x
    x = 235,692,069.76/12,949.29
  6. Step 6: Final answer
    x = 18,201.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.