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Finding the Fourth Proportional to 659,609.10, 989,413.65 and 393,669.90

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Solution

The fourth proportional to 659,609.10, 989,413.65 and 393,669.90 is: 590,504.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,609.10 : 989,413.65 = 393,669.90 : x
  2. Step 2: Convert to fraction form
    659,609.10/989,413.65 = 393,669.90/x
  3. Step 3: Cross multiply
    659,609.10x = 989,413.65 × 393,669.90
  4. Step 4: Simplify right side
    659,609.10x = 389,502,372,654.14
  5. Step 5: Solve for x
    x = 389,502,372,654.14/659,609.10
  6. Step 6: Final answer
    x = 590,504.85

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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.