Home / 31,138.48-42,971.64-16,991.44

Finding the Fourth Proportional to 31,138.48, 42,971.64 and 16,991.44

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Solution

The fourth proportional to 31,138.48, 42,971.64 and 16,991.44 is: 23,448.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.48 : 42,971.64 = 16,991.44 : x
  2. Step 2: Convert to fraction form
    31,138.48/42,971.64 = 16,991.44/x
  3. Step 3: Cross multiply
    31,138.48x = 42,971.64 × 16,991.44
  4. Step 4: Simplify right side
    31,138.48x = 730,150,042.76
  5. Step 5: Solve for x
    x = 730,150,042.76/31,138.48
  6. Step 6: Final answer
    x = 23,448.48

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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.