Home / 12,720.13-19,086.35-7,787.09

Finding the Fourth Proportional to 12,720.13, 19,086.35 and 7,787.09

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Solution

The fourth proportional to 12,720.13, 19,086.35 and 7,787.09 is: 11,684.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.13 : 19,086.35 = 7,787.09 : x
  2. Step 2: Convert to fraction form
    12,720.13/19,086.35 = 7,787.09/x
  3. Step 3: Cross multiply
    12,720.13x = 19,086.35 × 7,787.09
  4. Step 4: Simplify right side
    12,720.13x = 148,627,134.00
  5. Step 5: Solve for x
    x = 148,627,134.00/12,720.13
  6. Step 6: Final answer
    x = 11,684.41

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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.