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Finding the Fourth Proportional to 39,889.52, 55,048.69 and 21,985.68

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Solution

The fourth proportional to 39,889.52, 55,048.69 and 21,985.68 is: 30,340.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,889.52 : 55,048.69 = 21,985.68 : x
  2. Step 2: Convert to fraction form
    39,889.52/55,048.69 = 21,985.68/x
  3. Step 3: Cross multiply
    39,889.52x = 55,048.69 × 21,985.68
  4. Step 4: Simplify right side
    39,889.52x = 1,210,282,882.76
  5. Step 5: Solve for x
    x = 1,210,282,882.76/39,889.52
  6. Step 6: Final answer
    x = 30,340.87

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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.