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Finding the Fourth Proportional to 15,081.34, 20,813.07 and 9,780.70

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Solution

The fourth proportional to 15,081.34, 20,813.07 and 9,780.70 is: 13,497.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,081.34 : 20,813.07 = 9,780.70 : x
  2. Step 2: Convert to fraction form
    15,081.34/20,813.07 = 9,780.70/x
  3. Step 3: Cross multiply
    15,081.34x = 20,813.07 × 9,780.70
  4. Step 4: Simplify right side
    15,081.34x = 203,566,393.75
  5. Step 5: Solve for x
    x = 203,566,393.75/15,081.34
  6. Step 6: Final answer
    x = 13,497.90

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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.