Home / 13,128.90-18,118.32-7,160.90

Finding the Fourth Proportional to 13,128.90, 18,118.32 and 7,160.90

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Solution

The fourth proportional to 13,128.90, 18,118.32 and 7,160.90 is: 9,882.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.90 : 18,118.32 = 7,160.90 : x
  2. Step 2: Convert to fraction form
    13,128.90/18,118.32 = 7,160.90/x
  3. Step 3: Cross multiply
    13,128.90x = 18,118.32 × 7,160.90
  4. Step 4: Simplify right side
    13,128.90x = 129,743,477.69
  5. Step 5: Solve for x
    x = 129,743,477.69/13,128.90
  6. Step 6: Final answer
    x = 9,882.28

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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.