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Finding the Fourth Proportional to 13,391.40, 18,479.12 and 7,340.68

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Solution

The fourth proportional to 13,391.40, 18,479.12 and 7,340.68 is: 10,129.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,391.40 : 18,479.12 = 7,340.68 : x
  2. Step 2: Convert to fraction form
    13,391.40/18,479.12 = 7,340.68/x
  3. Step 3: Cross multiply
    13,391.40x = 18,479.12 × 7,340.68
  4. Step 4: Simplify right side
    13,391.40x = 135,649,230.34
  5. Step 5: Solve for x
    x = 135,649,230.34/13,391.40
  6. Step 6: Final answer
    x = 10,129.58

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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.