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Finding the Fourth Proportional to 18,718.68, 28,084.50 and 12,503.64

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Solution

The fourth proportional to 18,718.68, 28,084.50 and 12,503.64 is: 18,759.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718.68 : 28,084.50 = 12,503.64 : x
  2. Step 2: Convert to fraction form
    18,718.68/28,084.50 = 12,503.64/x
  3. Step 3: Cross multiply
    18,718.68x = 28,084.50 × 12,503.64
  4. Step 4: Simplify right side
    18,718.68x = 351,158,477.58
  5. Step 5: Solve for x
    x = 351,158,477.58/18,718.68
  6. Step 6: Final answer
    x = 18,759.79

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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.