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Finding the Fourth Proportional to 645.64, 890.98 and 350.90

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Solution

The fourth proportional to 645.64, 890.98 and 350.90 is: 484.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.64 : 890.98 = 350.90 : x
  2. Step 2: Convert to fraction form
    645.64/890.98 = 350.90/x
  3. Step 3: Cross multiply
    645.64x = 890.98 × 350.90
  4. Step 4: Simplify right side
    645.64x = 312,646.23
  5. Step 5: Solve for x
    x = 312,646.23/645.64
  6. Step 6: Final answer
    x = 484.25

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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.