Home / 128,699,487.90-177,608,969.19-78,466,605.66

Finding the Fourth Proportional to 128,699,487.90, 177,608,969.19 and 78,466,605.66

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Solution

The fourth proportional to 128,699,487.90, 177,608,969.19 and 78,466,605.66 is: 108,286,156.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,699,487.90 : 177,608,969.19 = 78,466,605.66 : x
  2. Step 2: Convert to fraction form
    128,699,487.90/177,608,969.19 = 78,466,605.66/x
  3. Step 3: Cross multiply
    128,699,487.90x = 177,608,969.19 × 78,466,605.66
  4. Step 4: Simplify right side
    128,699,487.90x = 13,936,372,947,110,818
  5. Step 5: Solve for x
    x = 13,936,372,947,110,818/128,699,487.90
  6. Step 6: Final answer
    x = 108,286,156.96

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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.