Home / 20,787.43-31,184.23-7,638.77

Finding the Fourth Proportional to 20,787.43, 31,184.23 and 7,638.77

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Solution

The fourth proportional to 20,787.43, 31,184.23 and 7,638.77 is: 11,459.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.43 : 31,184.23 = 7,638.77 : x
  2. Step 2: Convert to fraction form
    20,787.43/31,184.23 = 7,638.77/x
  3. Step 3: Cross multiply
    20,787.43x = 31,184.23 × 7,638.77
  4. Step 4: Simplify right side
    20,787.43x = 238,209,219.46
  5. Step 5: Solve for x
    x = 238,209,219.46/20,787.43
  6. Step 6: Final answer
    x = 11,459.29

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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.