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Finding the Fourth Proportional to 31,637, 43,659.82 and 20,478.44

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Solution

The fourth proportional to 31,637, 43,659.82 and 20,478.44 is: 28,260.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,637 : 43,659.82 = 20,478.44 : x
  2. Step 2: Convert to fraction form
    31,637/43,659.82 = 20,478.44/x
  3. Step 3: Cross multiply
    31,637x = 43,659.82 × 20,478.44
  4. Step 4: Simplify right side
    31,637x = 894,085,004.28
  5. Step 5: Solve for x
    x = 894,085,004.28/31,637
  6. Step 6: Final answer
    x = 28,260.74

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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.