Home / 30,815.20-42,513.60-20,210.80

Finding the Fourth Proportional to 30,815.20, 42,513.60 and 20,210.80

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Solution

The fourth proportional to 30,815.20, 42,513.60 and 20,210.80 is: 27,883.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,815.20 : 42,513.60 = 20,210.80 : x
  2. Step 2: Convert to fraction form
    30,815.20/42,513.60 = 20,210.80/x
  3. Step 3: Cross multiply
    30,815.20x = 42,513.60 × 20,210.80
  4. Step 4: Simplify right side
    30,815.20x = 859,233,866.88
  5. Step 5: Solve for x
    x = 859,233,866.88/30,815.20
  6. Step 6: Final answer
    x = 27,883.44

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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.