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Finding the Fourth Proportional to 20,913.48, 31,308.48 and 11,031.48

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Solution

The fourth proportional to 20,913.48, 31,308.48 and 11,031.48 is: 16,514.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,913.48 : 31,308.48 = 11,031.48 : x
  2. Step 2: Convert to fraction form
    20,913.48/31,308.48 = 11,031.48/x
  3. Step 3: Cross multiply
    20,913.48x = 31,308.48 × 11,031.48
  4. Step 4: Simplify right side
    20,913.48x = 345,378,870.95
  5. Step 5: Solve for x
    x = 345,378,870.95/20,913.48
  6. Step 6: Final answer
    x = 16,514.65

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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.