Home / 30,639.57-42,298.73-20,620.68

Finding the Fourth Proportional to 30,639.57, 42,298.73 and 20,620.68

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Solution

The fourth proportional to 30,639.57, 42,298.73 and 20,620.68 is: 28,467.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,639.57 : 42,298.73 = 20,620.68 : x
  2. Step 2: Convert to fraction form
    30,639.57/42,298.73 = 20,620.68/x
  3. Step 3: Cross multiply
    30,639.57x = 42,298.73 × 20,620.68
  4. Step 4: Simplify right side
    30,639.57x = 872,228,261.14
  5. Step 5: Solve for x
    x = 872,228,261.14/30,639.57
  6. Step 6: Final answer
    x = 28,467.38

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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.