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Finding the Fourth Proportional to 920.19, 1,377.81 and 486.42

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Solution

The fourth proportional to 920.19, 1,377.81 and 486.42 is: 728.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.19 : 1,377.81 = 486.42 : x
  2. Step 2: Convert to fraction form
    920.19/1,377.81 = 486.42/x
  3. Step 3: Cross multiply
    920.19x = 1,377.81 × 486.42
  4. Step 4: Simplify right side
    920.19x = 670,194.34
  5. Step 5: Solve for x
    x = 670,194.34/920.19
  6. Step 6: Final answer
    x = 728.32

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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.