Home / 20,818.80-28,730.63-11,387.36

Finding the Fourth Proportional to 20,818.80, 28,730.63 and 11,387.36

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Solution

The fourth proportional to 20,818.80, 28,730.63 and 11,387.36 is: 15,714.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.80 : 28,730.63 = 11,387.36 : x
  2. Step 2: Convert to fraction form
    20,818.80/28,730.63 = 11,387.36/x
  3. Step 3: Cross multiply
    20,818.80x = 28,730.63 × 11,387.36
  4. Step 4: Simplify right side
    20,818.80x = 327,166,127.13
  5. Step 5: Solve for x
    x = 327,166,127.13/20,818.80
  6. Step 6: Final answer
    x = 15,714.94

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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.