Home / 30,920.42-42,653.84-21,971.54

Finding the Fourth Proportional to 30,920.42, 42,653.84 and 21,971.54

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Solution

The fourth proportional to 30,920.42, 42,653.84 and 21,971.54 is: 30,309.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,920.42 : 42,653.84 = 21,971.54 : x
  2. Step 2: Convert to fraction form
    30,920.42/42,653.84 = 21,971.54/x
  3. Step 3: Cross multiply
    30,920.42x = 42,653.84 × 21,971.54
  4. Step 4: Simplify right side
    30,920.42x = 937,170,551.71
  5. Step 5: Solve for x
    x = 937,170,551.71/30,920.42
  6. Step 6: Final answer
    x = 30,309.11

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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.