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Finding the Fourth Proportional to 13,695.40, 18,900.22 and 8,657.80

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Solution

The fourth proportional to 13,695.40, 18,900.22 and 8,657.80 is: 11,948.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,695.40 : 18,900.22 = 8,657.80 : x
  2. Step 2: Convert to fraction form
    13,695.40/18,900.22 = 8,657.80/x
  3. Step 3: Cross multiply
    13,695.40x = 18,900.22 × 8,657.80
  4. Step 4: Simplify right side
    13,695.40x = 163,634,324.72
  5. Step 5: Solve for x
    x = 163,634,324.72/13,695.40
  6. Step 6: Final answer
    x = 11,948.12

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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.