Home / 21,158.70-31,740.81-7,112.71

Finding the Fourth Proportional to 21,158.70, 31,740.81 and 7,112.71

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Solution

The fourth proportional to 21,158.70, 31,740.81 and 7,112.71 is: 10,669.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,158.70 : 31,740.81 = 7,112.71 : x
  2. Step 2: Convert to fraction form
    21,158.70/31,740.81 = 7,112.71/x
  3. Step 3: Cross multiply
    21,158.70x = 31,740.81 × 7,112.71
  4. Step 4: Simplify right side
    21,158.70x = 225,763,176.70
  5. Step 5: Solve for x
    x = 225,763,176.70/21,158.70
  6. Step 6: Final answer
    x = 10,669.99

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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.