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Finding the Fourth Proportional to 13,071.78, 18,039.51 and 7,103.90

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Solution

The fourth proportional to 13,071.78, 18,039.51 and 7,103.90 is: 9,803.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,071.78 : 18,039.51 = 7,103.90 : x
  2. Step 2: Convert to fraction form
    13,071.78/18,039.51 = 7,103.90/x
  3. Step 3: Cross multiply
    13,071.78x = 18,039.51 × 7,103.90
  4. Step 4: Simplify right side
    13,071.78x = 128,150,920.19
  5. Step 5: Solve for x
    x = 128,150,920.19/13,071.78
  6. Step 6: Final answer
    x = 9,803.63

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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.