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Finding the Fourth Proportional to 71,603.12, 98,849.40 and 66,891.44

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Solution

The fourth proportional to 71,603.12, 98,849.40 and 66,891.44 is: 92,344.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,603.12 : 98,849.40 = 66,891.44 : x
  2. Step 2: Convert to fraction form
    71,603.12/98,849.40 = 66,891.44/x
  3. Step 3: Cross multiply
    71,603.12x = 98,849.40 × 66,891.44
  4. Step 4: Simplify right side
    71,603.12x = 6,612,178,709.14
  5. Step 5: Solve for x
    x = 6,612,178,709.14/71,603.12
  6. Step 6: Final answer
    x = 92,344.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.