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Finding the Fourth Proportional to 38,385.70, 52,971.46 and 21,389.88

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Solution

The fourth proportional to 38,385.70, 52,971.46 and 21,389.88 is: 29,517.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,385.70 : 52,971.46 = 21,389.88 : x
  2. Step 2: Convert to fraction form
    38,385.70/52,971.46 = 21,389.88/x
  3. Step 3: Cross multiply
    38,385.70x = 52,971.46 × 21,389.88
  4. Step 4: Simplify right side
    38,385.70x = 1,133,053,172.82
  5. Step 5: Solve for x
    x = 1,133,053,172.82/38,385.70
  6. Step 6: Final answer
    x = 29,517.59

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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.