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Finding the Fourth Proportional to 66,321.20, 99,499.40 and 28,865.20

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Solution

The fourth proportional to 66,321.20, 99,499.40 and 28,865.20 is: 43,305.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,321.20 : 99,499.40 = 28,865.20 : x
  2. Step 2: Convert to fraction form
    66,321.20/99,499.40 = 28,865.20/x
  3. Step 3: Cross multiply
    66,321.20x = 99,499.40 × 28,865.20
  4. Step 4: Simplify right side
    66,321.20x = 2,872,070,080.88
  5. Step 5: Solve for x
    x = 2,872,070,080.88/66,321.20
  6. Step 6: Final answer
    x = 43,305.46

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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.