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Finding the Fourth Proportional to 287,611.21, 397,620.93 and 215,866.68

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Solution

The fourth proportional to 287,611.21, 397,620.93 and 215,866.68 is: 298,434.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,611.21 : 397,620.93 = 215,866.68 : x
  2. Step 2: Convert to fraction form
    287,611.21/397,620.93 = 215,866.68/x
  3. Step 3: Cross multiply
    287,611.21x = 397,620.93 × 215,866.68
  4. Step 4: Simplify right side
    287,611.21x = 85,833,110,057.61
  5. Step 5: Solve for x
    x = 85,833,110,057.61/287,611.21
  6. Step 6: Final answer
    x = 298,434.51

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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.