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Finding the Fourth Proportional to 39,896.59, 55,055.12 and 21,990.18

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Solution

The fourth proportional to 39,896.59, 55,055.12 and 21,990.18 is: 30,345.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,896.59 : 55,055.12 = 21,990.18 : x
  2. Step 2: Convert to fraction form
    39,896.59/55,055.12 = 21,990.18/x
  3. Step 3: Cross multiply
    39,896.59x = 55,055.12 × 21,990.18
  4. Step 4: Simplify right side
    39,896.59x = 1,210,671,998.72
  5. Step 5: Solve for x
    x = 1,210,671,998.72/39,896.59
  6. Step 6: Final answer
    x = 30,345.25

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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.