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Finding the Fourth Proportional to 13,218, 18,235.84 and 8,438.12

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Solution

The fourth proportional to 13,218, 18,235.84 and 8,438.12 is: 11,641.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218 : 18,235.84 = 8,438.12 : x
  2. Step 2: Convert to fraction form
    13,218/18,235.84 = 8,438.12/x
  3. Step 3: Cross multiply
    13,218x = 18,235.84 × 8,438.12
  4. Step 4: Simplify right side
    13,218x = 153,876,206.22
  5. Step 5: Solve for x
    x = 153,876,206.22/13,218
  6. Step 6: Final answer
    x = 11,641.41

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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.