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Finding the Fourth Proportional to 387,876.75, 535,264.65 and 218,111.28

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Solution

The fourth proportional to 387,876.75, 535,264.65 and 218,111.28 is: 300,990.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,876.75 : 535,264.65 = 218,111.28 : x
  2. Step 2: Convert to fraction form
    387,876.75/535,264.65 = 218,111.28/x
  3. Step 3: Cross multiply
    387,876.75x = 535,264.65 × 218,111.28
  4. Step 4: Simplify right side
    387,876.75x = 116,747,257,950.25
  5. Step 5: Solve for x
    x = 116,747,257,950.25/387,876.75
  6. Step 6: Final answer
    x = 300,990.61

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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.