Home / 20,778.53-31,172.45-9,679.50

Finding the Fourth Proportional to 20,778.53, 31,172.45 and 9,679.50

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Solution

The fourth proportional to 20,778.53, 31,172.45 and 9,679.50 is: 14,521.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.53 : 31,172.45 = 9,679.50 : x
  2. Step 2: Convert to fraction form
    20,778.53/31,172.45 = 9,679.50/x
  3. Step 3: Cross multiply
    20,778.53x = 31,172.45 × 9,679.50
  4. Step 4: Simplify right side
    20,778.53x = 301,733,681.38
  5. Step 5: Solve for x
    x = 301,733,681.38/20,778.53
  6. Step 6: Final answer
    x = 14,521.42

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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.