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Finding the Fourth Proportional to 18,718.54, 28,081.85 and 8,715.85

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Solution

The fourth proportional to 18,718.54, 28,081.85 and 8,715.85 is: 13,075.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718.54 : 28,081.85 = 8,715.85 : x
  2. Step 2: Convert to fraction form
    18,718.54/28,081.85 = 8,715.85/x
  3. Step 3: Cross multiply
    18,718.54x = 28,081.85 × 8,715.85
  4. Step 4: Simplify right side
    18,718.54x = 244,757,192.32
  5. Step 5: Solve for x
    x = 244,757,192.32/18,718.54
  6. Step 6: Final answer
    x = 13,075.66

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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.