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Finding the Fourth Proportional to 20,672.55, 31,008.83 and 19,214.55

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Solution

The fourth proportional to 20,672.55, 31,008.83 and 19,214.55 is: 28,821.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.55 : 31,008.83 = 19,214.55 : x
  2. Step 2: Convert to fraction form
    20,672.55/31,008.83 = 19,214.55/x
  3. Step 3: Cross multiply
    20,672.55x = 31,008.83 × 19,214.55
  4. Step 4: Simplify right side
    20,672.55x = 595,820,618.40
  5. Step 5: Solve for x
    x = 595,820,618.40/20,672.55
  6. Step 6: Final answer
    x = 28,821.83

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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.