Home / 21,123.30-31,688.78-10,029.90

Finding the Fourth Proportional to 21,123.30, 31,688.78 and 10,029.90

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Solution

The fourth proportional to 21,123.30, 31,688.78 and 10,029.90 is: 15,046.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.30 : 31,688.78 = 10,029.90 : x
  2. Step 2: Convert to fraction form
    21,123.30/31,688.78 = 10,029.90/x
  3. Step 3: Cross multiply
    21,123.30x = 31,688.78 × 10,029.90
  4. Step 4: Simplify right side
    21,123.30x = 317,835,244.37
  5. Step 5: Solve for x
    x = 317,835,244.37/21,123.30
  6. Step 6: Final answer
    x = 15,046.67

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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.