Home / 13,215.90-18,239.40-7,912.02

Finding the Fourth Proportional to 13,215.90, 18,239.40 and 7,912.02

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Solution

The fourth proportional to 13,215.90, 18,239.40 and 7,912.02 is: 10,919.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,215.90 : 18,239.40 = 7,912.02 : x
  2. Step 2: Convert to fraction form
    13,215.90/18,239.40 = 7,912.02/x
  3. Step 3: Cross multiply
    13,215.90x = 18,239.40 × 7,912.02
  4. Step 4: Simplify right side
    13,215.90x = 144,310,497.59
  5. Step 5: Solve for x
    x = 144,310,497.59/13,215.90
  6. Step 6: Final answer
    x = 10,919.46

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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.