Home / 128,621.38-177,399.93-112,678.15

Finding the Fourth Proportional to 128,621.38, 177,399.93 and 112,678.15

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Solution

The fourth proportional to 128,621.38, 177,399.93 and 112,678.15 is: 155,410.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,621.38 : 177,399.93 = 112,678.15 : x
  2. Step 2: Convert to fraction form
    128,621.38/177,399.93 = 112,678.15/x
  3. Step 3: Cross multiply
    128,621.38x = 177,399.93 × 112,678.15
  4. Step 4: Simplify right side
    128,621.38x = 19,989,095,922.53
  5. Step 5: Solve for x
    x = 19,989,095,922.53/128,621.38
  6. Step 6: Final answer
    x = 155,410.37

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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.