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Finding the Fourth Proportional to 85,957.40, 128,936.10 and 76,917.80

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Solution

The fourth proportional to 85,957.40, 128,936.10 and 76,917.80 is: 115,376.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,957.40 : 128,936.10 = 76,917.80 : x
  2. Step 2: Convert to fraction form
    85,957.40/128,936.10 = 76,917.80/x
  3. Step 3: Cross multiply
    85,957.40x = 128,936.10 × 76,917.80
  4. Step 4: Simplify right side
    85,957.40x = 9,917,481,152.58
  5. Step 5: Solve for x
    x = 9,917,481,152.58/85,957.40
  6. Step 6: Final answer
    x = 115,376.70

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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.