Home / 31,138.80-42,971.16-16,991.32

Finding the Fourth Proportional to 31,138.80, 42,971.16 and 16,991.32

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Solution

The fourth proportional to 31,138.80, 42,971.16 and 16,991.32 is: 23,447.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.80 : 42,971.16 = 16,991.32 : x
  2. Step 2: Convert to fraction form
    31,138.80/42,971.16 = 16,991.32/x
  3. Step 3: Cross multiply
    31,138.80x = 42,971.16 × 16,991.32
  4. Step 4: Simplify right side
    31,138.80x = 730,136,730.33
  5. Step 5: Solve for x
    x = 730,136,730.33/31,138.80
  6. Step 6: Final answer
    x = 23,447.81

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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.