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Finding the Fourth Proportional to 13,616.63, 18,794.18 and 8,315.90

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Solution

The fourth proportional to 13,616.63, 18,794.18 and 8,315.90 is: 11,477.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,616.63 : 18,794.18 = 8,315.90 : x
  2. Step 2: Convert to fraction form
    13,616.63/18,794.18 = 8,315.90/x
  3. Step 3: Cross multiply
    13,616.63x = 18,794.18 × 8,315.90
  4. Step 4: Simplify right side
    13,616.63x = 156,290,521.46
  5. Step 5: Solve for x
    x = 156,290,521.46/13,616.63
  6. Step 6: Final answer
    x = 11,477.91

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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.