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Finding the Fourth Proportional to 287,051.54, 396,241.35 and 215,638.70

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Solution

The fourth proportional to 287,051.54, 396,241.35 and 215,638.70 is: 297,664.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,051.54 : 396,241.35 = 215,638.70 : x
  2. Step 2: Convert to fraction form
    287,051.54/396,241.35 = 215,638.70/x
  3. Step 3: Cross multiply
    287,051.54x = 396,241.35 × 215,638.70
  4. Step 4: Simplify right side
    287,051.54x = 85,444,969,600.25
  5. Step 5: Solve for x
    x = 85,444,969,600.25/287,051.54
  6. Step 6: Final answer
    x = 297,664.21

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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.