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Finding the Fourth Proportional to 13,137.91, 18,130.15 and 7,169.69

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Solution

The fourth proportional to 13,137.91, 18,130.15 and 7,169.69 is: 9,894.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.91 : 18,130.15 = 7,169.69 : x
  2. Step 2: Convert to fraction form
    13,137.91/18,130.15 = 7,169.69/x
  3. Step 3: Cross multiply
    13,137.91x = 18,130.15 × 7,169.69
  4. Step 4: Simplify right side
    13,137.91x = 129,987,555.15
  5. Step 5: Solve for x
    x = 129,987,555.15/13,137.91
  6. Step 6: Final answer
    x = 9,894.08

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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.