Home / 28,749.13-39,639.86-19,678.87

Finding the Fourth Proportional to 28,749.13, 39,639.86 and 19,678.87

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Solution

The fourth proportional to 28,749.13, 39,639.86 and 19,678.87 is: 27,133.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,749.13 : 39,639.86 = 19,678.87 : x
  2. Step 2: Convert to fraction form
    28,749.13/39,639.86 = 19,678.87/x
  3. Step 3: Cross multiply
    28,749.13x = 39,639.86 × 19,678.87
  4. Step 4: Simplify right side
    28,749.13x = 780,067,651.76
  5. Step 5: Solve for x
    x = 780,067,651.76/28,749.13
  6. Step 6: Final answer
    x = 27,133.61

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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.