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Finding the Fourth Proportional to 15,512.80, 21,764 and 15,512.80

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Solution

The fourth proportional to 15,512.80, 21,764 and 15,512.80 is: 21,764

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,512.80 : 21,764 = 15,512.80 : x
  2. Step 2: Convert to fraction form
    15,512.80/21,764 = 15,512.80/x
  3. Step 3: Cross multiply
    15,512.80x = 21,764 × 15,512.80
  4. Step 4: Simplify right side
    15,512.80x = 337,620,579.20
  5. Step 5: Solve for x
    x = 337,620,579.20/15,512.80
  6. Step 6: Final answer
    x = 21,764

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.