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Finding the Fourth Proportional to 18,688.15, 27,911.12 and 16,929.64

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Solution

The fourth proportional to 18,688.15, 27,911.12 and 16,929.64 is: 25,284.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.15 : 27,911.12 = 16,929.64 : x
  2. Step 2: Convert to fraction form
    18,688.15/27,911.12 = 16,929.64/x
  3. Step 3: Cross multiply
    18,688.15x = 27,911.12 × 16,929.64
  4. Step 4: Simplify right side
    18,688.15x = 472,525,163.84
  5. Step 5: Solve for x
    x = 472,525,163.84/18,688.15
  6. Step 6: Final answer
    x = 25,284.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.