Home / 31,138.65-42,971.48-16,991.80

Finding the Fourth Proportional to 31,138.65, 42,971.48 and 16,991.80

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Solution

The fourth proportional to 31,138.65, 42,971.48 and 16,991.80 is: 23,448.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.65 : 42,971.48 = 16,991.80 : x
  2. Step 2: Convert to fraction form
    31,138.65/42,971.48 = 16,991.80/x
  3. Step 3: Cross multiply
    31,138.65x = 42,971.48 × 16,991.80
  4. Step 4: Simplify right side
    31,138.65x = 730,162,793.86
  5. Step 5: Solve for x
    x = 730,162,793.86/31,138.65
  6. Step 6: Final answer
    x = 23,448.76

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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.