Home / 20,823.79-31,247.90-7,685.32

Finding the Fourth Proportional to 20,823.79, 31,247.90 and 7,685.32

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Solution

The fourth proportional to 20,823.79, 31,247.90 and 7,685.32 is: 11,532.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,823.79 : 31,247.90 = 7,685.32 : x
  2. Step 2: Convert to fraction form
    20,823.79/31,247.90 = 7,685.32/x
  3. Step 3: Cross multiply
    20,823.79x = 31,247.90 × 7,685.32
  4. Step 4: Simplify right side
    20,823.79x = 240,149,916.16
  5. Step 5: Solve for x
    x = 240,149,916.16/20,823.79
  6. Step 6: Final answer
    x = 11,532.48

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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.