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Finding the Fourth Proportional to 659,413.58, 989,109.63 and 210,128.38

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Solution

The fourth proportional to 659,413.58, 989,109.63 and 210,128.38 is: 315,189.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,413.58 : 989,109.63 = 210,128.38 : x
  2. Step 2: Convert to fraction form
    659,413.58/989,109.63 = 210,128.38/x
  3. Step 3: Cross multiply
    659,413.58x = 989,109.63 × 210,128.38
  4. Step 4: Simplify right side
    659,413.58x = 207,840,001,721.53
  5. Step 5: Solve for x
    x = 207,840,001,721.53/659,413.58
  6. Step 6: Final answer
    x = 315,189.15

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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.