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Finding the Fourth Proportional to 20,488.80, 30,731.58 and 7,339.80

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Solution

The fourth proportional to 20,488.80, 30,731.58 and 7,339.80 is: 11,009.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,488.80 : 30,731.58 = 7,339.80 : x
  2. Step 2: Convert to fraction form
    20,488.80/30,731.58 = 7,339.80/x
  3. Step 3: Cross multiply
    20,488.80x = 30,731.58 × 7,339.80
  4. Step 4: Simplify right side
    20,488.80x = 225,563,650.88
  5. Step 5: Solve for x
    x = 225,563,650.88/20,488.80
  6. Step 6: Final answer
    x = 11,009.12

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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.