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Finding the Fourth Proportional to 16,890.70, 23,310.06 and 9,721.70

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Solution

The fourth proportional to 16,890.70, 23,310.06 and 9,721.70 is: 13,416.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,890.70 : 23,310.06 = 9,721.70 : x
  2. Step 2: Convert to fraction form
    16,890.70/23,310.06 = 9,721.70/x
  3. Step 3: Cross multiply
    16,890.70x = 23,310.06 × 9,721.70
  4. Step 4: Simplify right side
    16,890.70x = 226,613,410.30
  5. Step 5: Solve for x
    x = 226,613,410.30/16,890.70
  6. Step 6: Final answer
    x = 13,416.46

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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.