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Finding the Fourth Proportional to 1,413.88, 2,120.72 and 623.32

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Solution

The fourth proportional to 1,413.88, 2,120.72 and 623.32 is: 934.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.88 : 2,120.72 = 623.32 : x
  2. Step 2: Convert to fraction form
    1,413.88/2,120.72 = 623.32/x
  3. Step 3: Cross multiply
    1,413.88x = 2,120.72 × 623.32
  4. Step 4: Simplify right side
    1,413.88x = 1,321,878.77
  5. Step 5: Solve for x
    x = 1,321,878.77/1,413.88
  6. Step 6: Final answer
    x = 934.93

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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.