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Finding the Fourth Proportional to 85,991.70, 128,878.20 and 76,587.60

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Solution

The fourth proportional to 85,991.70, 128,878.20 and 76,587.60 is: 114,784.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,991.70 : 128,878.20 = 76,587.60 : x
  2. Step 2: Convert to fraction form
    85,991.70/128,878.20 = 76,587.60/x
  3. Step 3: Cross multiply
    85,991.70x = 128,878.20 × 76,587.60
  4. Step 4: Simplify right side
    85,991.70x = 9,870,472,030.32
  5. Step 5: Solve for x
    x = 9,870,472,030.32/85,991.70
  6. Step 6: Final answer
    x = 114,784.01

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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.