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Finding the Fourth Proportional to 85,740.33, 128,617.15 and 25,764.12

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Solution

The fourth proportional to 85,740.33, 128,617.15 and 25,764.12 is: 38,648.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,740.33 : 128,617.15 = 25,764.12 : x
  2. Step 2: Convert to fraction form
    85,740.33/128,617.15 = 25,764.12/x
  3. Step 3: Cross multiply
    85,740.33x = 128,617.15 × 25,764.12
  4. Step 4: Simplify right side
    85,740.33x = 3,313,707,742.73
  5. Step 5: Solve for x
    x = 3,313,707,742.73/85,740.33
  6. Step 6: Final answer
    x = 38,648.18

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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.