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Finding the Fourth Proportional to 21,030.96, 31,551.02 and 6,239

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Solution

The fourth proportional to 21,030.96, 31,551.02 and 6,239 is: 9,359.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,030.96 : 31,551.02 = 6,239 : x
  2. Step 2: Convert to fraction form
    21,030.96/31,551.02 = 6,239/x
  3. Step 3: Cross multiply
    21,030.96x = 31,551.02 × 6,239
  4. Step 4: Simplify right side
    21,030.96x = 196,846,813.78
  5. Step 5: Solve for x
    x = 196,846,813.78/21,030.96
  6. Step 6: Final answer
    x = 9,359.86

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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.