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Finding the Fourth Proportional to 39,889.47, 55,046.39 and 21,984.47

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Solution

The fourth proportional to 39,889.47, 55,046.39 and 21,984.47 is: 30,337.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,889.47 : 55,046.39 = 21,984.47 : x
  2. Step 2: Convert to fraction form
    39,889.47/55,046.39 = 21,984.47/x
  3. Step 3: Cross multiply
    39,889.47x = 55,046.39 × 21,984.47
  4. Step 4: Simplify right side
    39,889.47x = 1,210,165,964.13
  5. Step 5: Solve for x
    x = 1,210,165,964.13/39,889.47
  6. Step 6: Final answer
    x = 30,337.98

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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.