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Finding the Fourth Proportional to 388,009.72, 535,447.93 and 218,243.44

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Solution

The fourth proportional to 388,009.72, 535,447.93 and 218,243.44 is: 301,172.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,009.72 : 535,447.93 = 218,243.44 : x
  2. Step 2: Convert to fraction form
    388,009.72/535,447.93 = 218,243.44/x
  3. Step 3: Cross multiply
    388,009.72x = 535,447.93 × 218,243.44
  4. Step 4: Simplify right side
    388,009.72x = 116,857,997,092.86
  5. Step 5: Solve for x
    x = 116,857,997,092.86/388,009.72
  6. Step 6: Final answer
    x = 301,172.86

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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.