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Finding the Fourth Proportional to 18,989.66, 28,479.49 and 13,065.30

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Solution

The fourth proportional to 18,989.66, 28,479.49 and 13,065.30 is: 19,594.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.66 : 28,479.49 = 13,065.30 : x
  2. Step 2: Convert to fraction form
    18,989.66/28,479.49 = 13,065.30/x
  3. Step 3: Cross multiply
    18,989.66x = 28,479.49 × 13,065.30
  4. Step 4: Simplify right side
    18,989.66x = 372,093,080.70
  5. Step 5: Solve for x
    x = 372,093,080.70/18,989.66
  6. Step 6: Final answer
    x = 19,594.51

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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.