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Finding the Fourth Proportional to 1,413.07, 1,950.11 and 815.65

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Solution

The fourth proportional to 1,413.07, 1,950.11 and 815.65 is: 1,125.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.07 : 1,950.11 = 815.65 : x
  2. Step 2: Convert to fraction form
    1,413.07/1,950.11 = 815.65/x
  3. Step 3: Cross multiply
    1,413.07x = 1,950.11 × 815.65
  4. Step 4: Simplify right side
    1,413.07x = 1,590,607.22
  5. Step 5: Solve for x
    x = 1,590,607.22/1,413.07
  6. Step 6: Final answer
    x = 1,125.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.