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Finding the Fourth Proportional to 38,878.30, 53,644.53 and 21,880.28

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Solution

The fourth proportional to 38,878.30, 53,644.53 and 21,880.28 is: 30,190.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,878.30 : 53,644.53 = 21,880.28 : x
  2. Step 2: Convert to fraction form
    38,878.30/53,644.53 = 21,880.28/x
  3. Step 3: Cross multiply
    38,878.30x = 53,644.53 × 21,880.28
  4. Step 4: Simplify right side
    38,878.30x = 1,173,757,336.87
  5. Step 5: Solve for x
    x = 1,173,757,336.87/38,878.30
  6. Step 6: Final answer
    x = 30,190.55

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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.