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Finding the Fourth Proportional to 13,128.15, 18,116.91 and 7,159.98

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Solution

The fourth proportional to 13,128.15, 18,116.91 and 7,159.98 is: 9,880.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.15 : 18,116.91 = 7,159.98 : x
  2. Step 2: Convert to fraction form
    13,128.15/18,116.91 = 7,159.98/x
  3. Step 3: Cross multiply
    13,128.15x = 18,116.91 × 7,159.98
  4. Step 4: Simplify right side
    13,128.15x = 129,716,713.26
  5. Step 5: Solve for x
    x = 129,716,713.26/13,128.15
  6. Step 6: Final answer
    x = 9,880.81

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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.