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Finding the Fourth Proportional to 28,765.78, 43,148.31 and 7,989.10

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Solution

The fourth proportional to 28,765.78, 43,148.31 and 7,989.10 is: 11,983.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,765.78 : 43,148.31 = 7,989.10 : x
  2. Step 2: Convert to fraction form
    28,765.78/43,148.31 = 7,989.10/x
  3. Step 3: Cross multiply
    28,765.78x = 43,148.31 × 7,989.10
  4. Step 4: Simplify right side
    28,765.78x = 344,716,163.42
  5. Step 5: Solve for x
    x = 344,716,163.42/28,765.78
  6. Step 6: Final answer
    x = 11,983.55

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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.