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Finding the Fourth Proportional to 918.31, 1,376.44 and 398.74

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Solution

The fourth proportional to 918.31, 1,376.44 and 398.74 is: 597.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.31 : 1,376.44 = 398.74 : x
  2. Step 2: Convert to fraction form
    918.31/1,376.44 = 398.74/x
  3. Step 3: Cross multiply
    918.31x = 1,376.44 × 398.74
  4. Step 4: Simplify right side
    918.31x = 548,844.24
  5. Step 5: Solve for x
    x = 548,844.24/918.31
  6. Step 6: Final answer
    x = 597.67

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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.