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Finding the Fourth Proportional to 39,893.76, 55,053.18 and 21,988.80

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Solution

The fourth proportional to 39,893.76, 55,053.18 and 21,988.80 is: 30,344.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,893.76 : 55,053.18 = 21,988.80 : x
  2. Step 2: Convert to fraction form
    39,893.76/55,053.18 = 21,988.80/x
  3. Step 3: Cross multiply
    39,893.76x = 55,053.18 × 21,988.80
  4. Step 4: Simplify right side
    39,893.76x = 1,210,553,364.38
  5. Step 5: Solve for x
    x = 1,210,553,364.38/39,893.76
  6. Step 6: Final answer
    x = 30,344.43

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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.