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Finding the Fourth Proportional to 65,686.75, 90,648.08 and 35,878.75

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Solution

The fourth proportional to 65,686.75, 90,648.08 and 35,878.75 is: 49,512.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,686.75 : 90,648.08 = 35,878.75 : x
  2. Step 2: Convert to fraction form
    65,686.75/90,648.08 = 35,878.75/x
  3. Step 3: Cross multiply
    65,686.75x = 90,648.08 × 35,878.75
  4. Step 4: Simplify right side
    65,686.75x = 3,252,339,800.30
  5. Step 5: Solve for x
    x = 3,252,339,800.30/65,686.75
  6. Step 6: Final answer
    x = 49,512.87

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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.