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Finding the Fourth Proportional to 31,929.80, 44,009.12 and 21,840.84

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Solution

The fourth proportional to 31,929.80, 44,009.12 and 21,840.84 is: 30,103.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,929.80 : 44,009.12 = 21,840.84 : x
  2. Step 2: Convert to fraction form
    31,929.80/44,009.12 = 21,840.84/x
  3. Step 3: Cross multiply
    31,929.80x = 44,009.12 × 21,840.84
  4. Step 4: Simplify right side
    31,929.80x = 961,196,203.06
  5. Step 5: Solve for x
    x = 961,196,203.06/31,929.80
  6. Step 6: Final answer
    x = 30,103.43

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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.