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Finding the Fourth Proportional to 38,631, 53,310.78 and 20,967

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Solution

The fourth proportional to 38,631, 53,310.78 and 20,967 is: 28,934.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,631 : 53,310.78 = 20,967 : x
  2. Step 2: Convert to fraction form
    38,631/53,310.78 = 20,967/x
  3. Step 3: Cross multiply
    38,631x = 53,310.78 × 20,967
  4. Step 4: Simplify right side
    38,631x = 1,117,767,124.26
  5. Step 5: Solve for x
    x = 1,117,767,124.26/38,631
  6. Step 6: Final answer
    x = 28,934.46

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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.