Home / 128,699.76-177,605.55-72,111.54

Finding the Fourth Proportional to 128,699.76, 177,605.55 and 72,111.54

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Solution

The fourth proportional to 128,699.76, 177,605.55 and 72,111.54 is: 99,513.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,699.76 : 177,605.55 = 72,111.54 : x
  2. Step 2: Convert to fraction form
    128,699.76/177,605.55 = 72,111.54/x
  3. Step 3: Cross multiply
    128,699.76x = 177,605.55 × 72,111.54
  4. Step 4: Simplify right side
    128,699.76x = 12,807,409,723.05
  5. Step 5: Solve for x
    x = 12,807,409,723.05/128,699.76
  6. Step 6: Final answer
    x = 99,513.86

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1.5x scale

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.