Home / 20,809.89-28,717.70-11,378.48

Finding the Fourth Proportional to 20,809.89, 28,717.70 and 11,378.48

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Solution

The fourth proportional to 20,809.89, 28,717.70 and 11,378.48 is: 15,702.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.89 : 28,717.70 = 11,378.48 : x
  2. Step 2: Convert to fraction form
    20,809.89/28,717.70 = 11,378.48/x
  3. Step 3: Cross multiply
    20,809.89x = 28,717.70 × 11,378.48
  4. Step 4: Simplify right side
    20,809.89x = 326,763,574.62
  5. Step 5: Solve for x
    x = 326,763,574.62/20,809.89
  6. Step 6: Final answer
    x = 15,702.32

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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.