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Finding the Fourth Proportional to 66,489.80, 99,690.06 and 31,397

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Solution

The fourth proportional to 66,489.80, 99,690.06 and 31,397 is: 47,074.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,489.80 : 99,690.06 = 31,397 : x
  2. Step 2: Convert to fraction form
    66,489.80/99,690.06 = 31,397/x
  3. Step 3: Cross multiply
    66,489.80x = 99,690.06 × 31,397
  4. Step 4: Simplify right side
    66,489.80x = 3,129,968,813.82
  5. Step 5: Solve for x
    x = 3,129,968,813.82/66,489.80
  6. Step 6: Final answer
    x = 47,074.42

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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.