Home / 20,803.79-28,705.90-11,851.47

Finding the Fourth Proportional to 20,803.79, 28,705.90 and 11,851.47

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Solution

The fourth proportional to 20,803.79, 28,705.90 and 11,851.47 is: 16,353.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,803.79 : 28,705.90 = 11,851.47 : x
  2. Step 2: Convert to fraction form
    20,803.79/28,705.90 = 11,851.47/x
  3. Step 3: Cross multiply
    20,803.79x = 28,705.90 × 11,851.47
  4. Step 4: Simplify right side
    20,803.79x = 340,207,112.67
  5. Step 5: Solve for x
    x = 340,207,112.67/20,803.79
  6. Step 6: Final answer
    x = 16,353.13

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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.