Home / 39,895.83-55,056.39-21,990.45

Finding the Fourth Proportional to 39,895.83, 55,056.39 and 21,990.45

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Solution

The fourth proportional to 39,895.83, 55,056.39 and 21,990.45 is: 30,346.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,895.83 : 55,056.39 = 21,990.45 : x
  2. Step 2: Convert to fraction form
    39,895.83/55,056.39 = 21,990.45/x
  3. Step 3: Cross multiply
    39,895.83x = 55,056.39 × 21,990.45
  4. Step 4: Simplify right side
    39,895.83x = 1,210,714,791.48
  5. Step 5: Solve for x
    x = 1,210,714,791.48/39,895.83
  6. Step 6: Final answer
    x = 30,346.90

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Double scale
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Similar ratio
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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.