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Finding the Fourth Proportional to 30,640.69, 42,300.30 and 20,621.80

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Solution

The fourth proportional to 30,640.69, 42,300.30 and 20,621.80 is: 28,468.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,640.69 : 42,300.30 = 20,621.80 : x
  2. Step 2: Convert to fraction form
    30,640.69/42,300.30 = 20,621.80/x
  3. Step 3: Cross multiply
    30,640.69x = 42,300.30 × 20,621.80
  4. Step 4: Simplify right side
    30,640.69x = 872,308,326.54
  5. Step 5: Solve for x
    x = 872,308,326.54/30,640.69
  6. Step 6: Final answer
    x = 28,468.95

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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.