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Finding the Fourth Proportional to 21,809.40, 32,762.70 and 20,923.80

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Solution

The fourth proportional to 21,809.40, 32,762.70 and 20,923.80 is: 31,432.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,809.40 : 32,762.70 = 20,923.80 : x
  2. Step 2: Convert to fraction form
    21,809.40/32,762.70 = 20,923.80/x
  3. Step 3: Cross multiply
    21,809.40x = 32,762.70 × 20,923.80
  4. Step 4: Simplify right side
    21,809.40x = 685,520,182.26
  5. Step 5: Solve for x
    x = 685,520,182.26/21,809.40
  6. Step 6: Final answer
    x = 31,432.33

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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.