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Finding the Fourth Proportional to 85,673.56, 128,485.68 and 29,511.40

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Solution

The fourth proportional to 85,673.56, 128,485.68 and 29,511.40 is: 44,258.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,673.56 : 128,485.68 = 29,511.40 : x
  2. Step 2: Convert to fraction form
    85,673.56/128,485.68 = 29,511.40/x
  3. Step 3: Cross multiply
    85,673.56x = 128,485.68 × 29,511.40
  4. Step 4: Simplify right side
    85,673.56x = 3,791,792,296.75
  5. Step 5: Solve for x
    x = 3,791,792,296.75/85,673.56
  6. Step 6: Final answer
    x = 44,258.61

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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.