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Finding the Fourth Proportional to 18,688.80, 27,995.40 and 11,647.20

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Solution

The fourth proportional to 18,688.80, 27,995.40 and 11,647.20 is: 17,447.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.80 : 27,995.40 = 11,647.20 : x
  2. Step 2: Convert to fraction form
    18,688.80/27,995.40 = 11,647.20/x
  3. Step 3: Cross multiply
    18,688.80x = 27,995.40 × 11,647.20
  4. Step 4: Simplify right side
    18,688.80x = 326,068,022.88
  5. Step 5: Solve for x
    x = 326,068,022.88/18,688.80
  6. Step 6: Final answer
    x = 17,447.24

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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.