Home / 128,628.12-177,517.80-74,918.10

Finding the Fourth Proportional to 128,628.12, 177,517.80 and 74,918.10

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Solution

The fourth proportional to 128,628.12, 177,517.80 and 74,918.10 is: 103,393.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,628.12 : 177,517.80 = 74,918.10 : x
  2. Step 2: Convert to fraction form
    128,628.12/177,517.80 = 74,918.10/x
  3. Step 3: Cross multiply
    128,628.12x = 177,517.80 × 74,918.10
  4. Step 4: Simplify right side
    128,628.12x = 13,299,296,292.18
  5. Step 5: Solve for x
    x = 13,299,296,292.18/128,628.12
  6. Step 6: Final answer
    x = 103,393.38

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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.