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Finding the Fourth Proportional to 13,127.91, 18,116.91 and 7,159.92

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Solution

The fourth proportional to 13,127.91, 18,116.91 and 7,159.92 is: 9,880.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,127.91 : 18,116.91 = 7,159.92 : x
  2. Step 2: Convert to fraction form
    13,127.91/18,116.91 = 7,159.92/x
  3. Step 3: Cross multiply
    13,127.91x = 18,116.91 × 7,159.92
  4. Step 4: Simplify right side
    13,127.91x = 129,715,626.25
  5. Step 5: Solve for x
    x = 129,715,626.25/13,127.91
  6. Step 6: Final answer
    x = 9,880.90

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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.