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Finding the Fourth Proportional to 20,501.20, 30,751.80 and 20,371.60

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Solution

The fourth proportional to 20,501.20, 30,751.80 and 20,371.60 is: 30,557.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,501.20 : 30,751.80 = 20,371.60 : x
  2. Step 2: Convert to fraction form
    20,501.20/30,751.80 = 20,371.60/x
  3. Step 3: Cross multiply
    20,501.20x = 30,751.80 × 20,371.60
  4. Step 4: Simplify right side
    20,501.20x = 626,463,368.88
  5. Step 5: Solve for x
    x = 626,463,368.88/20,501.20
  6. Step 6: Final answer
    x = 30,557.40

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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.