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Finding the Fourth Proportional to 445.16, 612.96 and 389.58

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Solution

The fourth proportional to 445.16, 612.96 and 389.58 is: 536.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.16 : 612.96 = 389.58 : x
  2. Step 2: Convert to fraction form
    445.16/612.96 = 389.58/x
  3. Step 3: Cross multiply
    445.16x = 612.96 × 389.58
  4. Step 4: Simplify right side
    445.16x = 238,796.96
  5. Step 5: Solve for x
    x = 238,796.96/445.16
  6. Step 6: Final answer
    x = 536.43

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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.