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Finding the Fourth Proportional to 1,279.08, 1,918.62 and 413.40

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Solution

The fourth proportional to 1,279.08, 1,918.62 and 413.40 is: 620.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.08 : 1,918.62 = 413.40 : x
  2. Step 2: Convert to fraction form
    1,279.08/1,918.62 = 413.40/x
  3. Step 3: Cross multiply
    1,279.08x = 1,918.62 × 413.40
  4. Step 4: Simplify right side
    1,279.08x = 793,157.51
  5. Step 5: Solve for x
    x = 793,157.51/1,279.08
  6. Step 6: Final answer
    x = 620.10

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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.