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Finding the Fourth Proportional to 14,987.99, 20,664.21 and 12,289.28

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Solution

The fourth proportional to 14,987.99, 20,664.21 and 12,289.28 is: 16,943.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,987.99 : 20,664.21 = 12,289.28 : x
  2. Step 2: Convert to fraction form
    14,987.99/20,664.21 = 12,289.28/x
  3. Step 3: Cross multiply
    14,987.99x = 20,664.21 × 12,289.28
  4. Step 4: Simplify right side
    14,987.99x = 253,948,205.43
  5. Step 5: Solve for x
    x = 253,948,205.43/14,987.99
  6. Step 6: Final answer
    x = 16,943.44

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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.