Home / 20,776.30-31,178.12-7,628.78

Finding the Fourth Proportional to 20,776.30, 31,178.12 and 7,628.78

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Solution

The fourth proportional to 20,776.30, 31,178.12 and 7,628.78 is: 11,448.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,776.30 : 31,178.12 = 7,628.78 : x
  2. Step 2: Convert to fraction form
    20,776.30/31,178.12 = 7,628.78/x
  3. Step 3: Cross multiply
    20,776.30x = 31,178.12 × 7,628.78
  4. Step 4: Simplify right side
    20,776.30x = 237,851,058.09
  5. Step 5: Solve for x
    x = 237,851,058.09/20,776.30
  6. Step 6: Final answer
    x = 11,448.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.