Home / 128,710.36-177,620.06-78,409.36

Finding the Fourth Proportional to 128,710.36, 177,620.06 and 78,409.36

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Solution

The fourth proportional to 128,710.36, 177,620.06 and 78,409.36 is: 108,204.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,710.36 : 177,620.06 = 78,409.36 : x
  2. Step 2: Convert to fraction form
    128,710.36/177,620.06 = 78,409.36/x
  3. Step 3: Cross multiply
    128,710.36x = 177,620.06 × 78,409.36
  4. Step 4: Simplify right side
    128,710.36x = 13,927,075,227.76
  5. Step 5: Solve for x
    x = 13,927,075,227.76/128,710.36
  6. Step 6: Final answer
    x = 108,204.77

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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.