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Finding the Fourth Proportional to 388,986.75, 536,801.72 and 210,138.75

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Solution

The fourth proportional to 388,986.75, 536,801.72 and 210,138.75 is: 289,991.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,986.75 : 536,801.72 = 210,138.75 : x
  2. Step 2: Convert to fraction form
    388,986.75/536,801.72 = 210,138.75/x
  3. Step 3: Cross multiply
    388,986.75x = 536,801.72 × 210,138.75
  4. Step 4: Simplify right side
    388,986.75x = 112,802,841,387.96
  5. Step 5: Solve for x
    x = 112,802,841,387.96/388,986.75
  6. Step 6: Final answer
    x = 289,991.48

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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.