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Finding the Fourth Proportional to 38,423, 57,634.50 and 10,721

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Solution

The fourth proportional to 38,423, 57,634.50 and 10,721 is: 16,081.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,423 : 57,634.50 = 10,721 : x
  2. Step 2: Convert to fraction form
    38,423/57,634.50 = 10,721/x
  3. Step 3: Cross multiply
    38,423x = 57,634.50 × 10,721
  4. Step 4: Simplify right side
    38,423x = 617,899,474.50
  5. Step 5: Solve for x
    x = 617,899,474.50/38,423
  6. Step 6: Final answer
    x = 16,081.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.