Home / 21,223.75-31,835.51-5,428.76

Finding the Fourth Proportional to 21,223.75, 31,835.51 and 5,428.76

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Solution

The fourth proportional to 21,223.75, 31,835.51 and 5,428.76 is: 8,143.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,223.75 : 31,835.51 = 5,428.76 : x
  2. Step 2: Convert to fraction form
    21,223.75/31,835.51 = 5,428.76/x
  3. Step 3: Cross multiply
    21,223.75x = 31,835.51 × 5,428.76
  4. Step 4: Simplify right side
    21,223.75x = 172,827,330.70
  5. Step 5: Solve for x
    x = 172,827,330.70/21,223.75
  6. Step 6: Final answer
    x = 8,143.11

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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.