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Finding the Fourth Proportional to 443.55, 661.15 and 436.26

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Solution

The fourth proportional to 443.55, 661.15 and 436.26 is: 650.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.55 : 661.15 = 436.26 : x
  2. Step 2: Convert to fraction form
    443.55/661.15 = 436.26/x
  3. Step 3: Cross multiply
    443.55x = 661.15 × 436.26
  4. Step 4: Simplify right side
    443.55x = 288,433.30
  5. Step 5: Solve for x
    x = 288,433.30/443.55
  6. Step 6: Final answer
    x = 650.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.