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Finding the Fourth Proportional to 908.16, 1,361.67 and 420.59

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Solution

The fourth proportional to 908.16, 1,361.67 and 420.59 is: 630.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.16 : 1,361.67 = 420.59 : x
  2. Step 2: Convert to fraction form
    908.16/1,361.67 = 420.59/x
  3. Step 3: Cross multiply
    908.16x = 1,361.67 × 420.59
  4. Step 4: Simplify right side
    908.16x = 572,697.98
  5. Step 5: Solve for x
    x = 572,697.98/908.16
  6. Step 6: Final answer
    x = 630.61

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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.