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Finding the Fourth Proportional to 918.15, 1,376.31 and 455.22

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Solution

The fourth proportional to 918.15, 1,376.31 and 455.22 is: 682.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.15 : 1,376.31 = 455.22 : x
  2. Step 2: Convert to fraction form
    918.15/1,376.31 = 455.22/x
  3. Step 3: Cross multiply
    918.15x = 1,376.31 × 455.22
  4. Step 4: Simplify right side
    918.15x = 626,523.84
  5. Step 5: Solve for x
    x = 626,523.84/918.15
  6. Step 6: Final answer
    x = 682.38

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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.