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Finding the Fourth Proportional to 256,991.90, 354,645.75 and 143,815.58

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Solution

The fourth proportional to 256,991.90, 354,645.75 and 143,815.58 is: 198,463.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,991.90 : 354,645.75 = 143,815.58 : x
  2. Step 2: Convert to fraction form
    256,991.90/354,645.75 = 143,815.58/x
  3. Step 3: Cross multiply
    256,991.90x = 354,645.75 × 143,815.58
  4. Step 4: Simplify right side
    256,991.90x = 51,003,584,230.79
  5. Step 5: Solve for x
    x = 51,003,584,230.79/256,991.90
  6. Step 6: Final answer
    x = 198,463.78

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1.5x scale

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.