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Finding the Fourth Proportional to 12,669.16, 18,987.22 and 6,818.90

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Solution

The fourth proportional to 12,669.16, 18,987.22 and 6,818.90 is: 10,219.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,669.16 : 18,987.22 = 6,818.90 : x
  2. Step 2: Convert to fraction form
    12,669.16/18,987.22 = 6,818.90/x
  3. Step 3: Cross multiply
    12,669.16x = 18,987.22 × 6,818.90
  4. Step 4: Simplify right side
    12,669.16x = 129,471,954.46
  5. Step 5: Solve for x
    x = 129,471,954.46/12,669.16
  6. Step 6: Final answer
    x = 10,219.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.