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Finding the Fourth Proportional to 39,889.70, 55,045.32 and 21,983.71

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Solution

The fourth proportional to 39,889.70, 55,045.32 and 21,983.71 is: 30,336.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,889.70 : 55,045.32 = 21,983.71 : x
  2. Step 2: Convert to fraction form
    39,889.70/55,045.32 = 21,983.71/x
  3. Step 3: Cross multiply
    39,889.70x = 55,045.32 × 21,983.71
  4. Step 4: Simplify right side
    39,889.70x = 1,210,100,351.74
  5. Step 5: Solve for x
    x = 1,210,100,351.74/39,889.70
  6. Step 6: Final answer
    x = 30,336.16

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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.