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Finding the Fourth Proportional to 16,820.20, 25,208.70 and 12,905.20

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Solution

The fourth proportional to 16,820.20, 25,208.70 and 12,905.20 is: 19,341.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,820.20 : 25,208.70 = 12,905.20 : x
  2. Step 2: Convert to fraction form
    16,820.20/25,208.70 = 12,905.20/x
  3. Step 3: Cross multiply
    16,820.20x = 25,208.70 × 12,905.20
  4. Step 4: Simplify right side
    16,820.20x = 325,323,315.24
  5. Step 5: Solve for x
    x = 325,323,315.24/16,820.20
  6. Step 6: Final answer
    x = 19,341.23

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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.