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Finding the Fourth Proportional to 85,890.80, 128,776.20 and 50,812.40

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Solution

The fourth proportional to 85,890.80, 128,776.20 and 50,812.40 is: 76,183.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,890.80 : 128,776.20 = 50,812.40 : x
  2. Step 2: Convert to fraction form
    85,890.80/128,776.20 = 50,812.40/x
  3. Step 3: Cross multiply
    85,890.80x = 128,776.20 × 50,812.40
  4. Step 4: Simplify right side
    85,890.80x = 6,543,427,784.88
  5. Step 5: Solve for x
    x = 6,543,427,784.88/85,890.80
  6. Step 6: Final answer
    x = 76,183.10

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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.