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Finding the Fourth Proportional to 83,220.30, 124,830.10 and 20,890.80

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Solution

The fourth proportional to 83,220.30, 124,830.10 and 20,890.80 is: 31,336.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,220.30 : 124,830.10 = 20,890.80 : x
  2. Step 2: Convert to fraction form
    83,220.30/124,830.10 = 20,890.80/x
  3. Step 3: Cross multiply
    83,220.30x = 124,830.10 × 20,890.80
  4. Step 4: Simplify right side
    83,220.30x = 2,607,800,653.08
  5. Step 5: Solve for x
    x = 2,607,800,653.08/83,220.30
  6. Step 6: Final answer
    x = 31,336.11

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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.