Home / 20,817.79-31,238.90-7,679.32

Finding the Fourth Proportional to 20,817.79, 31,238.90 and 7,679.32

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Solution

The fourth proportional to 20,817.79, 31,238.90 and 7,679.32 is: 11,523.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.79 : 31,238.90 = 7,679.32 : x
  2. Step 2: Convert to fraction form
    20,817.79/31,238.90 = 7,679.32/x
  3. Step 3: Cross multiply
    20,817.79x = 31,238.90 × 7,679.32
  4. Step 4: Simplify right side
    20,817.79x = 239,893,509.55
  5. Step 5: Solve for x
    x = 239,893,509.55/20,817.79
  6. Step 6: Final answer
    x = 11,523.49

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1.5x scale

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.