Home / 12,986.78-19,478.73-4,221.68

Finding the Fourth Proportional to 12,986.78, 19,478.73 and 4,221.68

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Solution

The fourth proportional to 12,986.78, 19,478.73 and 4,221.68 is: 6,332.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,986.78 : 19,478.73 = 4,221.68 : x
  2. Step 2: Convert to fraction form
    12,986.78/19,478.73 = 4,221.68/x
  3. Step 3: Cross multiply
    12,986.78x = 19,478.73 × 4,221.68
  4. Step 4: Simplify right side
    12,986.78x = 82,232,964.87
  5. Step 5: Solve for x
    x = 82,232,964.87/12,986.78
  6. Step 6: Final answer
    x = 6,332.05

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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.