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Finding the Fourth Proportional to 21,953.60, 32,930.40 and 20,139.20

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Solution

The fourth proportional to 21,953.60, 32,930.40 and 20,139.20 is: 30,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,953.60 : 32,930.40 = 20,139.20 : x
  2. Step 2: Convert to fraction form
    21,953.60/32,930.40 = 20,139.20/x
  3. Step 3: Cross multiply
    21,953.60x = 32,930.40 × 20,139.20
  4. Step 4: Simplify right side
    21,953.60x = 663,191,911.68
  5. Step 5: Solve for x
    x = 663,191,911.68/21,953.60
  6. Step 6: Final answer
    x = 30,208.80

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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.