Home / 21,210.92-31,816.40-7,171

Finding the Fourth Proportional to 21,210.92, 31,816.40 and 7,171

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Solution

The fourth proportional to 21,210.92, 31,816.40 and 7,171 is: 10,756.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,210.92 : 31,816.40 = 7,171 : x
  2. Step 2: Convert to fraction form
    21,210.92/31,816.40 = 7,171/x
  3. Step 3: Cross multiply
    21,210.92x = 31,816.40 × 7,171
  4. Step 4: Simplify right side
    21,210.92x = 228,155,404.40
  5. Step 5: Solve for x
    x = 228,155,404.40/21,210.92
  6. Step 6: Final answer
    x = 10,756.51

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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.