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Finding the Fourth Proportional to 645.85, 889.69 and 468.29

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Solution

The fourth proportional to 645.85, 889.69 and 468.29 is: 645.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.85 : 889.69 = 468.29 : x
  2. Step 2: Convert to fraction form
    645.85/889.69 = 468.29/x
  3. Step 3: Cross multiply
    645.85x = 889.69 × 468.29
  4. Step 4: Simplify right side
    645.85x = 416,635.38
  5. Step 5: Solve for x
    x = 416,635.38/645.85
  6. Step 6: Final answer
    x = 645.09

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1.5x scale

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.