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Finding the Fourth Proportional to 920.90, 1,381.91 and 373.04

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Solution

The fourth proportional to 920.90, 1,381.91 and 373.04 is: 559.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.90 : 1,381.91 = 373.04 : x
  2. Step 2: Convert to fraction form
    920.90/1,381.91 = 373.04/x
  3. Step 3: Cross multiply
    920.90x = 1,381.91 × 373.04
  4. Step 4: Simplify right side
    920.90x = 515,512.04
  5. Step 5: Solve for x
    x = 515,512.04/920.90
  6. Step 6: Final answer
    x = 559.79

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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.