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Finding the Fourth Proportional to 71,671.91, 98,907.35 and 39,840.53

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Solution

The fourth proportional to 71,671.91, 98,907.35 and 39,840.53 is: 54,979.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,671.91 : 98,907.35 = 39,840.53 : x
  2. Step 2: Convert to fraction form
    71,671.91/98,907.35 = 39,840.53/x
  3. Step 3: Cross multiply
    71,671.91x = 98,907.35 × 39,840.53
  4. Step 4: Simplify right side
    71,671.91x = 3,940,520,551.16
  5. Step 5: Solve for x
    x = 3,940,520,551.16/71,671.91
  6. Step 6: Final answer
    x = 54,979.99

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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.