Home / 13,138.51-18,131.53-7,170.57

Finding the Fourth Proportional to 13,138.51, 18,131.53 and 7,170.57

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Solution

The fourth proportional to 13,138.51, 18,131.53 and 7,170.57 is: 9,895.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.51 : 18,131.53 = 7,170.57 : x
  2. Step 2: Convert to fraction form
    13,138.51/18,131.53 = 7,170.57/x
  3. Step 3: Cross multiply
    13,138.51x = 18,131.53 × 7,170.57
  4. Step 4: Simplify right side
    13,138.51x = 130,013,405.07
  5. Step 5: Solve for x
    x = 130,013,405.07/13,138.51
  6. Step 6: Final answer
    x = 9,895.60

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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.