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Finding the Fourth Proportional to 908.02, 1,361.64 and 388

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Solution

The fourth proportional to 908.02, 1,361.64 and 388 is: 581.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.02 : 1,361.64 = 388 : x
  2. Step 2: Convert to fraction form
    908.02/1,361.64 = 388/x
  3. Step 3: Cross multiply
    908.02x = 1,361.64 × 388
  4. Step 4: Simplify right side
    908.02x = 528,316.32
  5. Step 5: Solve for x
    x = 528,316.32/908.02
  6. Step 6: Final answer
    x = 581.83

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