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Finding the Fourth Proportional to 20,762.80, 31,079.60 and 20,098.50

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Solution

The fourth proportional to 20,762.80, 31,079.60 and 20,098.50 is: 30,085.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,762.80 : 31,079.60 = 20,098.50 : x
  2. Step 2: Convert to fraction form
    20,762.80/31,079.60 = 20,098.50/x
  3. Step 3: Cross multiply
    20,762.80x = 31,079.60 × 20,098.50
  4. Step 4: Simplify right side
    20,762.80x = 624,653,198.93
  5. Step 5: Solve for x
    x = 624,653,198.93/20,762.80
  6. Step 6: Final answer
    x = 30,085.21

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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.