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Finding the Fourth Proportional to 388,866.50, 536,635.78 and 210,018.50

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Solution

The fourth proportional to 388,866.50, 536,635.78 and 210,018.50 is: 289,825.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,866.50 : 536,635.78 = 210,018.50 : x
  2. Step 2: Convert to fraction form
    388,866.50/536,635.78 = 210,018.50/x
  3. Step 3: Cross multiply
    388,866.50x = 536,635.78 × 210,018.50
  4. Step 4: Simplify right side
    388,866.50x = 112,703,441,561.93
  5. Step 5: Solve for x
    x = 112,703,441,561.93/388,866.50
  6. Step 6: Final answer
    x = 289,825.54

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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.