Home / 128,938.95-177,999.26-81,265.59

Finding the Fourth Proportional to 128,938.95, 177,999.26 and 81,265.59

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Solution

The fourth proportional to 128,938.95, 177,999.26 and 81,265.59 is: 112,186.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,938.95 : 177,999.26 = 81,265.59 : x
  2. Step 2: Convert to fraction form
    128,938.95/177,999.26 = 81,265.59/x
  3. Step 3: Cross multiply
    128,938.95x = 177,999.26 × 81,265.59
  4. Step 4: Simplify right side
    128,938.95x = 14,465,214,477.14
  5. Step 5: Solve for x
    x = 14,465,214,477.14/128,938.95
  6. Step 6: Final answer
    x = 112,186.54

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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.