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Finding the Fourth Proportional to 386.00, 531.54 and 287.58

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Solution

The fourth proportional to 386.00, 531.54 and 287.58 is: 396.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.00 : 531.54 = 287.58 : x
  2. Step 2: Convert to fraction form
    386.00/531.54 = 287.58/x
  3. Step 3: Cross multiply
    386.00x = 531.54 × 287.58
  4. Step 4: Simplify right side
    386.00x = 152,860.27
  5. Step 5: Solve for x
    x = 152,860.27/386.00
  6. Step 6: Final answer
    x = 396.02

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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.