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Finding the Fourth Proportional to 13,491, 20,239.74 and 4,257

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Solution

The fourth proportional to 13,491, 20,239.74 and 4,257 is: 6,386.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,491 : 20,239.74 = 4,257 : x
  2. Step 2: Convert to fraction form
    13,491/20,239.74 = 4,257/x
  3. Step 3: Cross multiply
    13,491x = 20,239.74 × 4,257
  4. Step 4: Simplify right side
    13,491x = 86,160,573.18
  5. Step 5: Solve for x
    x = 86,160,573.18/13,491
  6. Step 6: Final answer
    x = 6,386.52

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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.