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Finding the Fourth Proportional to 287,667.21, 431,648.70 and 220,629.87

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Solution

The fourth proportional to 287,667.21, 431,648.70 and 220,629.87 is: 331,058.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,667.21 : 431,648.70 = 220,629.87 : x
  2. Step 2: Convert to fraction form
    287,667.21/431,648.70 = 220,629.87/x
  3. Step 3: Cross multiply
    287,667.21x = 431,648.70 × 220,629.87
  4. Step 4: Simplify right side
    287,667.21x = 95,234,596,566.67
  5. Step 5: Solve for x
    x = 95,234,596,566.67/287,667.21
  6. Step 6: Final answer
    x = 331,058.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.