Home / 30,590.11-42,169.66-21,621.79

Finding the Fourth Proportional to 30,590.11, 42,169.66 and 21,621.79

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Solution

The fourth proportional to 30,590.11, 42,169.66 and 21,621.79 is: 29,806.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,590.11 : 42,169.66 = 21,621.79 : x
  2. Step 2: Convert to fraction form
    30,590.11/42,169.66 = 21,621.79/x
  3. Step 3: Cross multiply
    30,590.11x = 42,169.66 × 21,621.79
  4. Step 4: Simplify right side
    30,590.11x = 911,783,213.93
  5. Step 5: Solve for x
    x = 911,783,213.93/30,590.11
  6. Step 6: Final answer
    x = 29,806.48

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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.