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Finding the Fourth Proportional to 85,622.80, 118,272.42 and 65,725.56

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Solution

The fourth proportional to 85,622.80, 118,272.42 and 65,725.56 is: 90,787.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,622.80 : 118,272.42 = 65,725.56 : x
  2. Step 2: Convert to fraction form
    85,622.80/118,272.42 = 65,725.56/x
  3. Step 3: Cross multiply
    85,622.80x = 118,272.42 × 65,725.56
  4. Step 4: Simplify right side
    85,622.80x = 7,773,521,037.06
  5. Step 5: Solve for x
    x = 7,773,521,037.06/85,622.80
  6. Step 6: Final answer
    x = 90,787.98

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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.