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Finding the Fourth Proportional to 66,445,608.80, 99,668,413.20 and 39,123,855.20

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Solution

The fourth proportional to 66,445,608.80, 99,668,413.20 and 39,123,855.20 is: 58,685,782.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,445,608.80 : 99,668,413.20 = 39,123,855.20 : x
  2. Step 2: Convert to fraction form
    66,445,608.80/99,668,413.20 = 39,123,855.20/x
  3. Step 3: Cross multiply
    66,445,608.80x = 99,668,413.20 × 39,123,855.20
  4. Step 4: Simplify right side
    66,445,608.80x = 3,899,412,566,050,569
  5. Step 5: Solve for x
    x = 3,899,412,566,050,569/66,445,608.80
  6. Step 6: Final answer
    x = 58,685,782.80

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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.