Home / 21,223.95-31,835.81-5,428.96

Finding the Fourth Proportional to 21,223.95, 31,835.81 and 5,428.96

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Solution

The fourth proportional to 21,223.95, 31,835.81 and 5,428.96 is: 8,143.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,223.95 : 31,835.81 = 5,428.96 : x
  2. Step 2: Convert to fraction form
    21,223.95/31,835.81 = 5,428.96/x
  3. Step 3: Cross multiply
    21,223.95x = 31,835.81 × 5,428.96
  4. Step 4: Simplify right side
    21,223.95x = 172,835,339.06
  5. Step 5: Solve for x
    x = 172,835,339.06/21,223.95
  6. Step 6: Final answer
    x = 8,143.41

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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.