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Finding the Fourth Proportional to 388,172.66, 535,672.78 and 218,406.38

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Solution

The fourth proportional to 388,172.66, 535,672.78 and 218,406.38 is: 301,397.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,172.66 : 535,672.78 = 218,406.38 : x
  2. Step 2: Convert to fraction form
    388,172.66/535,672.78 = 218,406.38/x
  3. Step 3: Cross multiply
    388,172.66x = 535,672.78 × 218,406.38
  4. Step 4: Simplify right side
    388,172.66x = 116,994,349,519.96
  5. Step 5: Solve for x
    x = 116,994,349,519.96/388,172.66
  6. Step 6: Final answer
    x = 301,397.71

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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.