Home / 21,168.76-31,753.59-7,129.21

Finding the Fourth Proportional to 21,168.76, 31,753.59 and 7,129.21

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Solution

The fourth proportional to 21,168.76, 31,753.59 and 7,129.21 is: 10,693.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,168.76 : 31,753.59 = 7,129.21 : x
  2. Step 2: Convert to fraction form
    21,168.76/31,753.59 = 7,129.21/x
  3. Step 3: Cross multiply
    21,168.76x = 31,753.59 × 7,129.21
  4. Step 4: Simplify right side
    21,168.76x = 226,378,011.36
  5. Step 5: Solve for x
    x = 226,378,011.36/21,168.76
  6. Step 6: Final answer
    x = 10,693.97

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1.5x scale

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.