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Finding the Fourth Proportional to 290,438,188.80, 406,915,795.20 and 290,438,188.80

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Solution

The fourth proportional to 290,438,188.80, 406,915,795.20 and 290,438,188.80 is: 406,915,795.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,438,188.80 : 406,915,795.20 = 290,438,188.80 : x
  2. Step 2: Convert to fraction form
    290,438,188.80/406,915,795.20 = 290,438,188.80/x
  3. Step 3: Cross multiply
    290,438,188.80x = 406,915,795.20 × 290,438,188.80
  4. Step 4: Simplify right side
    290,438,188.80x = 118,183,886,551,999,728
  5. Step 5: Solve for x
    x = 118,183,886,551,999,728/290,438,188.80
  6. Step 6: Final answer
    x = 406,915,795.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.