Home / 39,865.52-55,015.80-21,961.28

Finding the Fourth Proportional to 39,865.52, 55,015.80 and 21,961.28

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Solution

The fourth proportional to 39,865.52, 55,015.80 and 21,961.28 is: 30,307.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,865.52 : 55,015.80 = 21,961.28 : x
  2. Step 2: Convert to fraction form
    39,865.52/55,015.80 = 21,961.28/x
  3. Step 3: Cross multiply
    39,865.52x = 55,015.80 × 21,961.28
  4. Step 4: Simplify right side
    39,865.52x = 1,208,217,388.22
  5. Step 5: Solve for x
    x = 1,208,217,388.22/39,865.52
  6. Step 6: Final answer
    x = 30,307.33

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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.