Home / 12,936.36-19,407.78-5,145.78

Finding the Fourth Proportional to 12,936.36, 19,407.78 and 5,145.78

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Solution

The fourth proportional to 12,936.36, 19,407.78 and 5,145.78 is: 7,719.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,936.36 : 19,407.78 = 5,145.78 : x
  2. Step 2: Convert to fraction form
    12,936.36/19,407.78 = 5,145.78/x
  3. Step 3: Cross multiply
    12,936.36x = 19,407.78 × 5,145.78
  4. Step 4: Simplify right side
    12,936.36x = 99,868,166.17
  5. Step 5: Solve for x
    x = 99,868,166.17/12,936.36
  6. Step 6: Final answer
    x = 7,719.96

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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.