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Finding the Fourth Proportional to 21,207.79, 31,801.69 and 7,871.54

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Solution

The fourth proportional to 21,207.79, 31,801.69 and 7,871.54 is: 11,803.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,207.79 : 31,801.69 = 7,871.54 : x
  2. Step 2: Convert to fraction form
    21,207.79/31,801.69 = 7,871.54/x
  3. Step 3: Cross multiply
    21,207.79x = 31,801.69 × 7,871.54
  4. Step 4: Simplify right side
    21,207.79x = 250,328,235.54
  5. Step 5: Solve for x
    x = 250,328,235.54/21,207.79
  6. Step 6: Final answer
    x = 11,803.60

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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.