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Finding the Fourth Proportional to 20,615.50, 30,879.51 and 19,465.30

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Solution

The fourth proportional to 20,615.50, 30,879.51 and 19,465.30 is: 29,156.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.50 : 30,879.51 = 19,465.30 : x
  2. Step 2: Convert to fraction form
    20,615.50/30,879.51 = 19,465.30/x
  3. Step 3: Cross multiply
    20,615.50x = 30,879.51 × 19,465.30
  4. Step 4: Simplify right side
    20,615.50x = 601,078,926.00
  5. Step 5: Solve for x
    x = 601,078,926.00/20,615.50
  6. Step 6: Final answer
    x = 29,156.65

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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.