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Finding the Fourth Proportional to 38,728.88, 53,445.85 and 21,961.88

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Solution

The fourth proportional to 38,728.88, 53,445.85 and 21,961.88 is: 30,307.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,728.88 : 53,445.85 = 21,961.88 : x
  2. Step 2: Convert to fraction form
    38,728.88/53,445.85 = 21,961.88/x
  3. Step 3: Cross multiply
    38,728.88x = 53,445.85 × 21,961.88
  4. Step 4: Simplify right side
    38,728.88x = 1,173,771,022.06
  5. Step 5: Solve for x
    x = 1,173,771,022.06/38,728.88
  6. Step 6: Final answer
    x = 30,307.39

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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.