Home / 20,918.90-31,357.29-9,230.06

Finding the Fourth Proportional to 20,918.90, 31,357.29 and 9,230.06

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Solution

The fourth proportional to 20,918.90, 31,357.29 and 9,230.06 is: 13,835.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.90 : 31,357.29 = 9,230.06 : x
  2. Step 2: Convert to fraction form
    20,918.90/31,357.29 = 9,230.06/x
  3. Step 3: Cross multiply
    20,918.90x = 31,357.29 × 9,230.06
  4. Step 4: Simplify right side
    20,918.90x = 289,429,668.14
  5. Step 5: Solve for x
    x = 289,429,668.14/20,918.90
  6. Step 6: Final answer
    x = 13,835.80

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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.