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Finding the Fourth Proportional to 460.45, 689.59 and 428.05

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Solution

The fourth proportional to 460.45, 689.59 and 428.05 is: 641.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.45 : 689.59 = 428.05 : x
  2. Step 2: Convert to fraction form
    460.45/689.59 = 428.05/x
  3. Step 3: Cross multiply
    460.45x = 689.59 × 428.05
  4. Step 4: Simplify right side
    460.45x = 295,179.00
  5. Step 5: Solve for x
    x = 295,179.00/460.45
  6. Step 6: Final answer
    x = 641.07

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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.