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Finding the Fourth Proportional to 85,678.62, 128,485.98 and 29,502.84

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Solution

The fourth proportional to 85,678.62, 128,485.98 and 29,502.84 is: 44,243.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,678.62 : 128,485.98 = 29,502.84 : x
  2. Step 2: Convert to fraction form
    85,678.62/128,485.98 = 29,502.84/x
  3. Step 3: Cross multiply
    85,678.62x = 128,485.98 × 29,502.84
  4. Step 4: Simplify right side
    85,678.62x = 3,790,701,310.18
  5. Step 5: Solve for x
    x = 3,790,701,310.18/85,678.62
  6. Step 6: Final answer
    x = 44,243.26

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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.