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Finding the Fourth Proportional to 17,820.45, 26,712.45 and 10,421.10

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Solution

The fourth proportional to 17,820.45, 26,712.45 and 10,421.10 is: 15,620.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,820.45 : 26,712.45 = 10,421.10 : x
  2. Step 2: Convert to fraction form
    17,820.45/26,712.45 = 10,421.10/x
  3. Step 3: Cross multiply
    17,820.45x = 26,712.45 × 10,421.10
  4. Step 4: Simplify right side
    17,820.45x = 278,373,112.70
  5. Step 5: Solve for x
    x = 278,373,112.70/17,820.45
  6. Step 6: Final answer
    x = 15,620.99

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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.