Home / 18,780.20-28,185.69-7,686.99

Finding the Fourth Proportional to 18,780.20, 28,185.69 and 7,686.99

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Solution

The fourth proportional to 18,780.20, 28,185.69 and 7,686.99 is: 11,536.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,780.20 : 28,185.69 = 7,686.99 : x
  2. Step 2: Convert to fraction form
    18,780.20/28,185.69 = 7,686.99/x
  3. Step 3: Cross multiply
    18,780.20x = 28,185.69 × 7,686.99
  4. Step 4: Simplify right side
    18,780.20x = 216,663,117.17
  5. Step 5: Solve for x
    x = 216,663,117.17/18,780.20
  6. Step 6: Final answer
    x = 11,536.79

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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.