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Finding the Fourth Proportional to 908.86, 1,363.52 and 388.60

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Solution

The fourth proportional to 908.86, 1,363.52 and 388.60 is: 583.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.86 : 1,363.52 = 388.60 : x
  2. Step 2: Convert to fraction form
    908.86/1,363.52 = 388.60/x
  3. Step 3: Cross multiply
    908.86x = 1,363.52 × 388.60
  4. Step 4: Simplify right side
    908.86x = 529,866.92
  5. Step 5: Solve for x
    x = 529,866.92/908.86
  6. Step 6: Final answer
    x = 583.00

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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.