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Finding the Fourth Proportional to 21,271.26, 31,978.98 and 17,140.26

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Solution

The fourth proportional to 21,271.26, 31,978.98 and 17,140.26 is: 25,768.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,271.26 : 31,978.98 = 17,140.26 : x
  2. Step 2: Convert to fraction form
    21,271.26/31,978.98 = 17,140.26/x
  3. Step 3: Cross multiply
    21,271.26x = 31,978.98 × 17,140.26
  4. Step 4: Simplify right side
    21,271.26x = 548,128,031.73
  5. Step 5: Solve for x
    x = 548,128,031.73/21,271.26
  6. Step 6: Final answer
    x = 25,768.48

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1.5x scale

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.