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Finding the Fourth Proportional to 908.15, 1,362.42 and 258.93

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Solution

The fourth proportional to 908.15, 1,362.42 and 258.93 is: 388.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.15 : 1,362.42 = 258.93 : x
  2. Step 2: Convert to fraction form
    908.15/1,362.42 = 258.93/x
  3. Step 3: Cross multiply
    908.15x = 1,362.42 × 258.93
  4. Step 4: Simplify right side
    908.15x = 352,771.41
  5. Step 5: Solve for x
    x = 352,771.41/908.15
  6. Step 6: Final answer
    x = 388.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.