Home / 643,719.81-888,055.80-388,923.38

Finding the Fourth Proportional to 643,719.81, 888,055.80 and 388,923.38

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Solution

The fourth proportional to 643,719.81, 888,055.80 and 388,923.38 is: 536,546.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,719.81 : 888,055.80 = 388,923.38 : x
  2. Step 2: Convert to fraction form
    643,719.81/888,055.80 = 388,923.38/x
  3. Step 3: Cross multiply
    643,719.81x = 888,055.80 × 388,923.38
  4. Step 4: Simplify right side
    643,719.81x = 345,385,658,924.33
  5. Step 5: Solve for x
    x = 345,385,658,924.33/643,719.81
  6. Step 6: Final answer
    x = 536,546.57

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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.