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Finding the Fourth Proportional to 387,888.64, 535,289.56 and 218,121.28

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Solution

The fourth proportional to 387,888.64, 535,289.56 and 218,121.28 is: 301,009.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,888.64 : 535,289.56 = 218,121.28 : x
  2. Step 2: Convert to fraction form
    387,888.64/535,289.56 = 218,121.28/x
  3. Step 3: Cross multiply
    387,888.64x = 535,289.56 × 218,121.28
  4. Step 4: Simplify right side
    387,888.64x = 116,758,043,997.84
  5. Step 5: Solve for x
    x = 116,758,043,997.84/387,888.64
  6. Step 6: Final answer
    x = 301,009.19

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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.