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Finding the Fourth Proportional to 85,405.80, 128,145.15 and 41,009.70

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Solution

The fourth proportional to 85,405.80, 128,145.15 and 41,009.70 is: 61,532.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,405.80 : 128,145.15 = 41,009.70 : x
  2. Step 2: Convert to fraction form
    85,405.80/128,145.15 = 41,009.70/x
  3. Step 3: Cross multiply
    85,405.80x = 128,145.15 × 41,009.70
  4. Step 4: Simplify right side
    85,405.80x = 5,255,194,157.96
  5. Step 5: Solve for x
    x = 5,255,194,157.96/85,405.80
  6. Step 6: Final answer
    x = 61,532.05

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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.