Home / 30,996.12-42,781.44-20,386.80

Finding the Fourth Proportional to 30,996.12, 42,781.44 and 20,386.80

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Solution

The fourth proportional to 30,996.12, 42,781.44 and 20,386.80 is: 28,138.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,996.12 : 42,781.44 = 20,386.80 : x
  2. Step 2: Convert to fraction form
    30,996.12/42,781.44 = 20,386.80/x
  3. Step 3: Cross multiply
    30,996.12x = 42,781.44 × 20,386.80
  4. Step 4: Simplify right side
    30,996.12x = 872,176,660.99
  5. Step 5: Solve for x
    x = 872,176,660.99/30,996.12
  6. Step 6: Final answer
    x = 28,138.25

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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.