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Finding the Fourth Proportional to 387,889.64, 535,290.94 and 218,122.28

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Solution

The fourth proportional to 387,889.64, 535,290.94 and 218,122.28 is: 301,010.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,889.64 : 535,290.94 = 218,122.28 : x
  2. Step 2: Convert to fraction form
    387,889.64/535,290.94 = 218,122.28/x
  3. Step 3: Cross multiply
    387,889.64x = 535,290.94 × 218,122.28
  4. Step 4: Simplify right side
    387,889.64x = 116,758,880,296.14
  5. Step 5: Solve for x
    x = 116,758,880,296.14/387,889.64
  6. Step 6: Final answer
    x = 301,010.57

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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.