Home / 20,815.80-28,725.80-11,384.32

Finding the Fourth Proportional to 20,815.80, 28,725.80 and 11,384.32

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Solution

The fourth proportional to 20,815.80, 28,725.80 and 11,384.32 is: 15,710.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.80 : 28,725.80 = 11,384.32 : x
  2. Step 2: Convert to fraction form
    20,815.80/28,725.80 = 11,384.32/x
  3. Step 3: Cross multiply
    20,815.80x = 28,725.80 × 11,384.32
  4. Step 4: Simplify right side
    20,815.80x = 327,023,699.46
  5. Step 5: Solve for x
    x = 327,023,699.46/20,815.80
  6. Step 6: Final answer
    x = 15,710.36

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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.