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Finding the Fourth Proportional to 66,245.80, 99,239.10 and 39,872.20

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Solution

The fourth proportional to 66,245.80, 99,239.10 and 39,872.20 is: 59,730.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,245.80 : 99,239.10 = 39,872.20 : x
  2. Step 2: Convert to fraction form
    66,245.80/99,239.10 = 39,872.20/x
  3. Step 3: Cross multiply
    66,245.80x = 99,239.10 × 39,872.20
  4. Step 4: Simplify right side
    66,245.80x = 3,956,881,243.02
  5. Step 5: Solve for x
    x = 3,956,881,243.02/66,245.80
  6. Step 6: Final answer
    x = 59,730.30

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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.