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Finding the Fourth Proportional to 445.13, 612.82 and 386.89

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Solution

The fourth proportional to 445.13, 612.82 and 386.89 is: 532.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.13 : 612.82 = 386.89 : x
  2. Step 2: Convert to fraction form
    445.13/612.82 = 386.89/x
  3. Step 3: Cross multiply
    445.13x = 612.82 × 386.89
  4. Step 4: Simplify right side
    445.13x = 237,091.43
  5. Step 5: Solve for x
    x = 237,091.43/445.13
  6. Step 6: Final answer
    x = 532.64

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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.