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Finding the Fourth Proportional to 28,109.21, 42,163.82 and 7,332.71

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Solution

The fourth proportional to 28,109.21, 42,163.82 and 7,332.71 is: 10,999.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,109.21 : 42,163.82 = 7,332.71 : x
  2. Step 2: Convert to fraction form
    28,109.21/42,163.82 = 7,332.71/x
  3. Step 3: Cross multiply
    28,109.21x = 42,163.82 × 7,332.71
  4. Step 4: Simplify right side
    28,109.21x = 309,175,285.40
  5. Step 5: Solve for x
    x = 309,175,285.40/28,109.21
  6. Step 6: Final answer
    x = 10,999.07

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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.