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Finding the Fourth Proportional to 13,117.40, 18,099.08 and 7,811.18

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Solution

The fourth proportional to 13,117.40, 18,099.08 and 7,811.18 is: 10,777.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,117.40 : 18,099.08 = 7,811.18 : x
  2. Step 2: Convert to fraction form
    13,117.40/18,099.08 = 7,811.18/x
  3. Step 3: Cross multiply
    13,117.40x = 18,099.08 × 7,811.18
  4. Step 4: Simplify right side
    13,117.40x = 141,375,042.16
  5. Step 5: Solve for x
    x = 141,375,042.16/13,117.40
  6. Step 6: Final answer
    x = 10,777.68

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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.