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Finding the Fourth Proportional to 280,990.17, 421,706.67 and 103,621.72

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Solution

The fourth proportional to 280,990.17, 421,706.67 and 103,621.72 is: 155,514.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,990.17 : 421,706.67 = 103,621.72 : x
  2. Step 2: Convert to fraction form
    280,990.17/421,706.67 = 103,621.72/x
  3. Step 3: Cross multiply
    280,990.17x = 421,706.67 × 103,621.72
  4. Step 4: Simplify right side
    280,990.17x = 43,697,970,480.87
  5. Step 5: Solve for x
    x = 43,697,970,480.87/280,990.17
  6. Step 6: Final answer
    x = 155,514.23

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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.