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Finding the Fourth Proportional to 15,740.50, 21,721.97 and 8,666.91

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Solution

The fourth proportional to 15,740.50, 21,721.97 and 8,666.91 is: 11,960.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,740.50 : 21,721.97 = 8,666.91 : x
  2. Step 2: Convert to fraction form
    15,740.50/21,721.97 = 8,666.91/x
  3. Step 3: Cross multiply
    15,740.50x = 21,721.97 × 8,666.91
  4. Step 4: Simplify right side
    15,740.50x = 188,262,315.68
  5. Step 5: Solve for x
    x = 188,262,315.68/15,740.50
  6. Step 6: Final answer
    x = 11,960.38

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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.