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Finding the Fourth Proportional to 65,745.75, 90,721.91 and 40,258.55

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Solution

The fourth proportional to 65,745.75, 90,721.91 and 40,258.55 is: 55,552.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,745.75 : 90,721.91 = 40,258.55 : x
  2. Step 2: Convert to fraction form
    65,745.75/90,721.91 = 40,258.55/x
  3. Step 3: Cross multiply
    65,745.75x = 90,721.91 × 40,258.55
  4. Step 4: Simplify right side
    65,745.75x = 3,652,331,894.93
  5. Step 5: Solve for x
    x = 3,652,331,894.93/65,745.75
  6. Step 6: Final answer
    x = 55,552.36

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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.