Home / 20,983.86-31,312.17-19,120.86

Finding the Fourth Proportional to 20,983.86, 31,312.17 and 19,120.86

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Solution

The fourth proportional to 20,983.86, 31,312.17 and 19,120.86 is: 28,532.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,983.86 : 31,312.17 = 19,120.86 : x
  2. Step 2: Convert to fraction form
    20,983.86/31,312.17 = 19,120.86/x
  3. Step 3: Cross multiply
    20,983.86x = 31,312.17 × 19,120.86
  4. Step 4: Simplify right side
    20,983.86x = 598,715,618.87
  5. Step 5: Solve for x
    x = 598,715,618.87/20,983.86
  6. Step 6: Final answer
    x = 28,532.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.