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Finding the Fourth Proportional to 388,009.97, 535,448.27 and 218,243.69

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Solution

The fourth proportional to 388,009.97, 535,448.27 and 218,243.69 is: 301,173.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,009.97 : 535,448.27 = 218,243.69 : x
  2. Step 2: Convert to fraction form
    388,009.97/535,448.27 = 218,243.69/x
  3. Step 3: Cross multiply
    388,009.97x = 535,448.27 × 218,243.69
  4. Step 4: Simplify right side
    388,009.97x = 116,858,206,248.92
  5. Step 5: Solve for x
    x = 116,858,206,248.92/388,009.97
  6. Step 6: Final answer
    x = 301,173.21

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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.