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Finding the Fourth Proportional to 30,956.80, 42,721.24 and 18,210.90

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Solution

The fourth proportional to 30,956.80, 42,721.24 and 18,210.90 is: 25,131.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,956.80 : 42,721.24 = 18,210.90 : x
  2. Step 2: Convert to fraction form
    30,956.80/42,721.24 = 18,210.90/x
  3. Step 3: Cross multiply
    30,956.80x = 42,721.24 × 18,210.90
  4. Step 4: Simplify right side
    30,956.80x = 777,992,229.52
  5. Step 5: Solve for x
    x = 777,992,229.52/30,956.80
  6. Step 6: Final answer
    x = 25,131.55

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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.