Home / 30,935.61-42,664.79-20,850.80

Finding the Fourth Proportional to 30,935.61, 42,664.79 and 20,850.80

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Solution

The fourth proportional to 30,935.61, 42,664.79 and 20,850.80 is: 28,756.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,935.61 : 42,664.79 = 20,850.80 : x
  2. Step 2: Convert to fraction form
    30,935.61/42,664.79 = 20,850.80/x
  3. Step 3: Cross multiply
    30,935.61x = 42,664.79 × 20,850.80
  4. Step 4: Simplify right side
    30,935.61x = 889,594,685.75
  5. Step 5: Solve for x
    x = 889,594,685.75/30,935.61
  6. Step 6: Final answer
    x = 28,756.33

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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.