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Finding the Fourth Proportional to 85,731.40, 128,378.40 and 68,235.40

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Solution

The fourth proportional to 85,731.40, 128,378.40 and 68,235.40 is: 102,179.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,731.40 : 128,378.40 = 68,235.40 : x
  2. Step 2: Convert to fraction form
    85,731.40/128,378.40 = 68,235.40/x
  3. Step 3: Cross multiply
    85,731.40x = 128,378.40 × 68,235.40
  4. Step 4: Simplify right side
    85,731.40x = 8,759,951,475.36
  5. Step 5: Solve for x
    x = 8,759,951,475.36/85,731.40
  6. Step 6: Final answer
    x = 102,179.03

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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.