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Finding the Fourth Proportional to 39,894.50, 55,054.18 and 21,745.20

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Solution

The fourth proportional to 39,894.50, 55,054.18 and 21,745.20 is: 30,008.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,894.50 : 55,054.18 = 21,745.20 : x
  2. Step 2: Convert to fraction form
    39,894.50/55,054.18 = 21,745.20/x
  3. Step 3: Cross multiply
    39,894.50x = 55,054.18 × 21,745.20
  4. Step 4: Simplify right side
    39,894.50x = 1,197,164,154.94
  5. Step 5: Solve for x
    x = 1,197,164,154.94/39,894.50
  6. Step 6: Final answer
    x = 30,008.25

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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.