Home / 39,876.12-55,028.78-21,970.72

Finding the Fourth Proportional to 39,876.12, 55,028.78 and 21,970.72

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Solution

The fourth proportional to 39,876.12, 55,028.78 and 21,970.72 is: 30,319.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,876.12 : 55,028.78 = 21,970.72 : x
  2. Step 2: Convert to fraction form
    39,876.12/55,028.78 = 21,970.72/x
  3. Step 3: Cross multiply
    39,876.12x = 55,028.78 × 21,970.72
  4. Step 4: Simplify right side
    39,876.12x = 1,209,021,917.32
  5. Step 5: Solve for x
    x = 1,209,021,917.32/39,876.12
  6. Step 6: Final answer
    x = 30,319.45

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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.