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Finding the Fourth Proportional to 30,979.80, 42,751.80 and 16,832.70

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Solution

The fourth proportional to 30,979.80, 42,751.80 and 16,832.70 is: 23,228.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,979.80 : 42,751.80 = 16,832.70 : x
  2. Step 2: Convert to fraction form
    30,979.80/42,751.80 = 16,832.70/x
  3. Step 3: Cross multiply
    30,979.80x = 42,751.80 × 16,832.70
  4. Step 4: Simplify right side
    30,979.80x = 719,628,223.86
  5. Step 5: Solve for x
    x = 719,628,223.86/30,979.80
  6. Step 6: Final answer
    x = 23,228.95

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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.