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Finding the Fourth Proportional to 39,860.46, 55,009.94 and 21,955.46

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Solution

The fourth proportional to 39,860.46, 55,009.94 and 21,955.46 is: 30,299.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,860.46 : 55,009.94 = 21,955.46 : x
  2. Step 2: Convert to fraction form
    39,860.46/55,009.94 = 21,955.46/x
  3. Step 3: Cross multiply
    39,860.46x = 55,009.94 × 21,955.46
  4. Step 4: Simplify right side
    39,860.46x = 1,207,768,152.45
  5. Step 5: Solve for x
    x = 1,207,768,152.45/39,860.46
  6. Step 6: Final answer
    x = 30,299.91

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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.