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Finding the Fourth Proportional to 645.07, 890.45 and 435.84

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Solution

The fourth proportional to 645.07, 890.45 and 435.84 is: 601.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.07 : 890.45 = 435.84 : x
  2. Step 2: Convert to fraction form
    645.07/890.45 = 435.84/x
  3. Step 3: Cross multiply
    645.07x = 890.45 × 435.84
  4. Step 4: Simplify right side
    645.07x = 388,093.77
  5. Step 5: Solve for x
    x = 388,093.77/645.07
  6. Step 6: Final answer
    x = 601.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.