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Finding the Fourth Proportional to 15,203.46, 20,980.57 and 8,489.20

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Solution

The fourth proportional to 15,203.46, 20,980.57 and 8,489.20 is: 11,714.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,203.46 : 20,980.57 = 8,489.20 : x
  2. Step 2: Convert to fraction form
    15,203.46/20,980.57 = 8,489.20/x
  3. Step 3: Cross multiply
    15,203.46x = 20,980.57 × 8,489.20
  4. Step 4: Simplify right side
    15,203.46x = 178,108,254.84
  5. Step 5: Solve for x
    x = 178,108,254.84/15,203.46
  6. Step 6: Final answer
    x = 11,714.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.