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Finding the Fourth Proportional to 351,801.60, 485,220.57 and 221,017.28

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Solution

The fourth proportional to 351,801.60, 485,220.57 and 221,017.28 is: 304,836.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,801.60 : 485,220.57 = 221,017.28 : x
  2. Step 2: Convert to fraction form
    351,801.60/485,220.57 = 221,017.28/x
  3. Step 3: Cross multiply
    351,801.60x = 485,220.57 × 221,017.28
  4. Step 4: Simplify right side
    351,801.60x = 107,242,128,155.35
  5. Step 5: Solve for x
    x = 107,242,128,155.35/351,801.60
  6. Step 6: Final answer
    x = 304,836.96

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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.