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Finding the Fourth Proportional to 645.59, 890.91 and 350.88

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Solution

The fourth proportional to 645.59, 890.91 and 350.88 is: 484.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.59 : 890.91 = 350.88 : x
  2. Step 2: Convert to fraction form
    645.59/890.91 = 350.88/x
  3. Step 3: Cross multiply
    645.59x = 890.91 × 350.88
  4. Step 4: Simplify right side
    645.59x = 312,602.50
  5. Step 5: Solve for x
    x = 312,602.50/645.59
  6. Step 6: Final answer
    x = 484.22

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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.