Home / 30,518.28-42,120.21-20,950.26

Finding the Fourth Proportional to 30,518.28, 42,120.21 and 20,950.26

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Solution

The fourth proportional to 30,518.28, 42,120.21 and 20,950.26 is: 28,914.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,518.28 : 42,120.21 = 20,950.26 : x
  2. Step 2: Convert to fraction form
    30,518.28/42,120.21 = 20,950.26/x
  3. Step 3: Cross multiply
    30,518.28x = 42,120.21 × 20,950.26
  4. Step 4: Simplify right side
    30,518.28x = 882,429,350.75
  5. Step 5: Solve for x
    x = 882,429,350.75/30,518.28
  6. Step 6: Final answer
    x = 28,914.78

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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.