Home / 15,919.36-21,895.68-12,768.64

Finding the Fourth Proportional to 15,919.36, 21,895.68 and 12,768.64

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Solution

The fourth proportional to 15,919.36, 21,895.68 and 12,768.64 is: 17,562.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,919.36 : 21,895.68 = 12,768.64 : x
  2. Step 2: Convert to fraction form
    15,919.36/21,895.68 = 12,768.64/x
  3. Step 3: Cross multiply
    15,919.36x = 21,895.68 × 12,768.64
  4. Step 4: Simplify right side
    15,919.36x = 279,578,055.48
  5. Step 5: Solve for x
    x = 279,578,055.48/15,919.36
  6. Step 6: Final answer
    x = 17,562.14

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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.