Home / 20,658.50-31,100.16-18,821.42

Finding the Fourth Proportional to 20,658.50, 31,100.16 and 18,821.42

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Solution

The fourth proportional to 20,658.50, 31,100.16 and 18,821.42 is: 28,334.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,658.50 : 31,100.16 = 18,821.42 : x
  2. Step 2: Convert to fraction form
    20,658.50/31,100.16 = 18,821.42/x
  3. Step 3: Cross multiply
    20,658.50x = 31,100.16 × 18,821.42
  4. Step 4: Simplify right side
    20,658.50x = 585,349,079.32
  5. Step 5: Solve for x
    x = 585,349,079.32/20,658.50
  6. Step 6: Final answer
    x = 28,334.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.