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Finding the Fourth Proportional to 65,449.96, 90,318.46 and 39,998.89

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Solution

The fourth proportional to 65,449.96, 90,318.46 and 39,998.89 is: 55,196.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,449.96 : 90,318.46 = 39,998.89 : x
  2. Step 2: Convert to fraction form
    65,449.96/90,318.46 = 39,998.89/x
  3. Step 3: Cross multiply
    65,449.96x = 90,318.46 × 39,998.89
  4. Step 4: Simplify right side
    65,449.96x = 3,612,638,146.51
  5. Step 5: Solve for x
    x = 3,612,638,146.51/65,449.96
  6. Step 6: Final answer
    x = 55,196.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.