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Finding the Fourth Proportional to 15,085.80, 20,820.90 and 8,798.18

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Solution

The fourth proportional to 15,085.80, 20,820.90 and 8,798.18 is: 12,142.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,085.80 : 20,820.90 = 8,798.18 : x
  2. Step 2: Convert to fraction form
    15,085.80/20,820.90 = 8,798.18/x
  3. Step 3: Cross multiply
    15,085.80x = 20,820.90 × 8,798.18
  4. Step 4: Simplify right side
    15,085.80x = 183,186,025.96
  5. Step 5: Solve for x
    x = 183,186,025.96/15,085.80
  6. Step 6: Final answer
    x = 12,142.94

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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.