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Finding the Fourth Proportional to 85,975.85, 128,963.78 and 56,082.80

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Solution

The fourth proportional to 85,975.85, 128,963.78 and 56,082.80 is: 84,124.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,975.85 : 128,963.78 = 56,082.80 : x
  2. Step 2: Convert to fraction form
    85,975.85/128,963.78 = 56,082.80/x
  3. Step 3: Cross multiply
    85,975.85x = 128,963.78 × 56,082.80
  4. Step 4: Simplify right side
    85,975.85x = 7,232,649,600.57
  5. Step 5: Solve for x
    x = 7,232,649,600.57/85,975.85
  6. Step 6: Final answer
    x = 84,124.20

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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.