Home / 20,917.32-28,888.56-12,978.48

Finding the Fourth Proportional to 20,917.32, 28,888.56 and 12,978.48

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Solution

The fourth proportional to 20,917.32, 28,888.56 and 12,978.48 is: 17,924.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.32 : 28,888.56 = 12,978.48 : x
  2. Step 2: Convert to fraction form
    20,917.32/28,888.56 = 12,978.48/x
  3. Step 3: Cross multiply
    20,917.32x = 28,888.56 × 12,978.48
  4. Step 4: Simplify right side
    20,917.32x = 374,929,598.19
  5. Step 5: Solve for x
    x = 374,929,598.19/20,917.32
  6. Step 6: Final answer
    x = 17,924.36

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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.