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Finding the Fourth Proportional to 85,730.40, 128,376.90 and 68,234.40

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Solution

The fourth proportional to 85,730.40, 128,376.90 and 68,234.40 is: 102,177.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,730.40 : 128,376.90 = 68,234.40 : x
  2. Step 2: Convert to fraction form
    85,730.40/128,376.90 = 68,234.40/x
  3. Step 3: Cross multiply
    85,730.40x = 128,376.90 × 68,234.40
  4. Step 4: Simplify right side
    85,730.40x = 8,759,720,745.36
  5. Step 5: Solve for x
    x = 8,759,720,745.36/85,730.40
  6. Step 6: Final answer
    x = 102,177.53

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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.