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Finding the Fourth Proportional to 18,993.87, 28,489.95 and 12,756.51

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Solution

The fourth proportional to 18,993.87, 28,489.95 and 12,756.51 is: 19,134.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,993.87 : 28,489.95 = 12,756.51 : x
  2. Step 2: Convert to fraction form
    18,993.87/28,489.95 = 12,756.51/x
  3. Step 3: Cross multiply
    18,993.87x = 28,489.95 × 12,756.51
  4. Step 4: Simplify right side
    18,993.87x = 363,432,332.07
  5. Step 5: Solve for x
    x = 363,432,332.07/18,993.87
  6. Step 6: Final answer
    x = 19,134.19

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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.