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Finding the Fourth Proportional to 280,989.17, 421,705.17 and 103,620.72

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Solution

The fourth proportional to 280,989.17, 421,705.17 and 103,620.72 is: 155,512.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,989.17 : 421,705.17 = 103,620.72 : x
  2. Step 2: Convert to fraction form
    280,989.17/421,705.17 = 103,620.72/x
  3. Step 3: Cross multiply
    280,989.17x = 421,705.17 × 103,620.72
  4. Step 4: Simplify right side
    280,989.17x = 43,697,393,343.12
  5. Step 5: Solve for x
    x = 43,697,393,343.12/280,989.17
  6. Step 6: Final answer
    x = 155,512.73

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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.