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Finding the Fourth Proportional to 919.33, 1,376.91 and 553.34

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Solution

The fourth proportional to 919.33, 1,376.91 and 553.34 is: 828.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.33 : 1,376.91 = 553.34 : x
  2. Step 2: Convert to fraction form
    919.33/1,376.91 = 553.34/x
  3. Step 3: Cross multiply
    919.33x = 1,376.91 × 553.34
  4. Step 4: Simplify right side
    919.33x = 761,902.82
  5. Step 5: Solve for x
    x = 761,902.82/919.33
  6. Step 6: Final answer
    x = 828.76

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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.