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Finding the Fourth Proportional to 20,085.80, 30,128.70 and 13,087.40

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Solution

The fourth proportional to 20,085.80, 30,128.70 and 13,087.40 is: 19,631.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,085.80 : 30,128.70 = 13,087.40 : x
  2. Step 2: Convert to fraction form
    20,085.80/30,128.70 = 13,087.40/x
  3. Step 3: Cross multiply
    20,085.80x = 30,128.70 × 13,087.40
  4. Step 4: Simplify right side
    20,085.80x = 394,306,348.38
  5. Step 5: Solve for x
    x = 394,306,348.38/20,085.80
  6. Step 6: Final answer
    x = 19,631.10

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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.