Home / 20,818.69-28,730.19-11,387.45

Finding the Fourth Proportional to 20,818.69, 28,730.19 and 11,387.45

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Solution

The fourth proportional to 20,818.69, 28,730.19 and 11,387.45 is: 15,714.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.69 : 28,730.19 = 11,387.45 : x
  2. Step 2: Convert to fraction form
    20,818.69/28,730.19 = 11,387.45/x
  3. Step 3: Cross multiply
    20,818.69x = 28,730.19 × 11,387.45
  4. Step 4: Simplify right side
    20,818.69x = 327,163,716.64
  5. Step 5: Solve for x
    x = 327,163,716.64/20,818.69
  6. Step 6: Final answer
    x = 15,714.91

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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.