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Finding the Fourth Proportional to 387,866.02, 535,251.90 and 218,096.50

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Solution

The fourth proportional to 387,866.02, 535,251.90 and 218,096.50 is: 300,971.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,866.02 : 535,251.90 = 218,096.50 : x
  2. Step 2: Convert to fraction form
    387,866.02/535,251.90 = 218,096.50/x
  3. Step 3: Cross multiply
    387,866.02x = 535,251.90 × 218,096.50
  4. Step 4: Simplify right side
    387,866.02x = 116,736,566,008.35
  5. Step 5: Solve for x
    x = 116,736,566,008.35/387,866.02
  6. Step 6: Final answer
    x = 300,971.37

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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.