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Finding the Fourth Proportional to 21,310, 29,392.59 and 18,472.30

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Solution

The fourth proportional to 21,310, 29,392.59 and 18,472.30 is: 25,478.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,310 : 29,392.59 = 18,472.30 : x
  2. Step 2: Convert to fraction form
    21,310/29,392.59 = 18,472.30/x
  3. Step 3: Cross multiply
    21,310x = 29,392.59 × 18,472.30
  4. Step 4: Simplify right side
    21,310x = 542,948,740.26
  5. Step 5: Solve for x
    x = 542,948,740.26/21,310
  6. Step 6: Final answer
    x = 25,478.59

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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.