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Finding the Fourth Proportional to 71,671.96, 98,905.35 and 39,840.04

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Solution

The fourth proportional to 71,671.96, 98,905.35 and 39,840.04 is: 54,978.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,671.96 : 98,905.35 = 39,840.04 : x
  2. Step 2: Convert to fraction form
    71,671.96/98,905.35 = 39,840.04/x
  3. Step 3: Cross multiply
    71,671.96x = 98,905.35 × 39,840.04
  4. Step 4: Simplify right side
    71,671.96x = 3,940,393,100.21
  5. Step 5: Solve for x
    x = 3,940,393,100.21/71,671.96
  6. Step 6: Final answer
    x = 54,978.17

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1.5x scale

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.