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Finding the Fourth Proportional to 85,678.56, 128,485.92 and 29,503.04

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Solution

The fourth proportional to 85,678.56, 128,485.92 and 29,503.04 is: 44,243.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,678.56 : 128,485.92 = 29,503.04 : x
  2. Step 2: Convert to fraction form
    85,678.56/128,485.92 = 29,503.04/x
  3. Step 3: Cross multiply
    85,678.56x = 128,485.92 × 29,503.04
  4. Step 4: Simplify right side
    85,678.56x = 3,790,725,237.20
  5. Step 5: Solve for x
    x = 3,790,725,237.20/85,678.56
  6. Step 6: Final answer
    x = 44,243.57

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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.