Home / 128,989.04-178,015.68-75,277.56

Finding the Fourth Proportional to 128,989.04, 178,015.68 and 75,277.56

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Solution

The fourth proportional to 128,989.04, 178,015.68 and 75,277.56 is: 103,889.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.04 : 178,015.68 = 75,277.56 : x
  2. Step 2: Convert to fraction form
    128,989.04/178,015.68 = 75,277.56/x
  3. Step 3: Cross multiply
    128,989.04x = 178,015.68 × 75,277.56
  4. Step 4: Simplify right side
    128,989.04x = 13,400,586,032.14
  5. Step 5: Solve for x
    x = 13,400,586,032.14/128,989.04
  6. Step 6: Final answer
    x = 103,889.34

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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.