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Finding the Fourth Proportional to 38,385.90, 52,971.84 and 21,618.90

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Solution

The fourth proportional to 38,385.90, 52,971.84 and 21,618.90 is: 29,833.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,385.90 : 52,971.84 = 21,618.90 : x
  2. Step 2: Convert to fraction form
    38,385.90/52,971.84 = 21,618.90/x
  3. Step 3: Cross multiply
    38,385.90x = 52,971.84 × 21,618.90
  4. Step 4: Simplify right side
    38,385.90x = 1,145,192,911.78
  5. Step 5: Solve for x
    x = 1,145,192,911.78/38,385.90
  6. Step 6: Final answer
    x = 29,833.69

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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.