Home / 20,490.69-28,289.21-19,309.71

Finding the Fourth Proportional to 20,490.69, 28,289.21 and 19,309.71

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Solution

The fourth proportional to 20,490.69, 28,289.21 and 19,309.71 is: 26,658.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.69 : 28,289.21 = 19,309.71 : x
  2. Step 2: Convert to fraction form
    20,490.69/28,289.21 = 19,309.71/x
  3. Step 3: Cross multiply
    20,490.69x = 28,289.21 × 19,309.71
  4. Step 4: Simplify right side
    20,490.69x = 546,256,344.68
  5. Step 5: Solve for x
    x = 546,256,344.68/20,490.69
  6. Step 6: Final answer
    x = 26,658.76

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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.