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Finding the Fourth Proportional to 920.63, 1,379.97 and 612.70

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Solution

The fourth proportional to 920.63, 1,379.97 and 612.70 is: 918.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.63 : 1,379.97 = 612.70 : x
  2. Step 2: Convert to fraction form
    920.63/1,379.97 = 612.70/x
  3. Step 3: Cross multiply
    920.63x = 1,379.97 × 612.70
  4. Step 4: Simplify right side
    920.63x = 845,504.17
  5. Step 5: Solve for x
    x = 845,504.17/920.63
  6. Step 6: Final answer
    x = 918.39

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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.