Home / 13,142.45-18,135.79-7,172.91

Finding the Fourth Proportional to 13,142.45, 18,135.79 and 7,172.91

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Solution

The fourth proportional to 13,142.45, 18,135.79 and 7,172.91 is: 9,898.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,142.45 : 18,135.79 = 7,172.91 : x
  2. Step 2: Convert to fraction form
    13,142.45/18,135.79 = 7,172.91/x
  3. Step 3: Cross multiply
    13,142.45x = 18,135.79 × 7,172.91
  4. Step 4: Simplify right side
    13,142.45x = 130,086,371.52
  5. Step 5: Solve for x
    x = 130,086,371.52/13,142.45
  6. Step 6: Final answer
    x = 9,898.18

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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.