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Finding the Fourth Proportional to 13,698.72, 18,894.06 and 8,321.13

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Solution

The fourth proportional to 13,698.72, 18,894.06 and 8,321.13 is: 11,476.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,698.72 : 18,894.06 = 8,321.13 : x
  2. Step 2: Convert to fraction form
    13,698.72/18,894.06 = 8,321.13/x
  3. Step 3: Cross multiply
    13,698.72x = 18,894.06 × 8,321.13
  4. Step 4: Simplify right side
    13,698.72x = 157,219,929.49
  5. Step 5: Solve for x
    x = 157,219,929.49/13,698.72
  6. Step 6: Final answer
    x = 11,476.98

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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.