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Finding the Fourth Proportional to 85,838.60, 128,757.90 and 72,878.60

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Solution

The fourth proportional to 85,838.60, 128,757.90 and 72,878.60 is: 109,317.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,838.60 : 128,757.90 = 72,878.60 : x
  2. Step 2: Convert to fraction form
    85,838.60/128,757.90 = 72,878.60/x
  3. Step 3: Cross multiply
    85,838.60x = 128,757.90 × 72,878.60
  4. Step 4: Simplify right side
    85,838.60x = 9,383,695,490.94
  5. Step 5: Solve for x
    x = 9,383,695,490.94/85,838.60
  6. Step 6: Final answer
    x = 109,317.90

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1.5x scale

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.