Home / 13,709.18-18,918.68-7,421.56

Finding the Fourth Proportional to 13,709.18, 18,918.68 and 7,421.56

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Solution

The fourth proportional to 13,709.18, 18,918.68 and 7,421.56 is: 10,241.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,709.18 : 18,918.68 = 7,421.56 : x
  2. Step 2: Convert to fraction form
    13,709.18/18,918.68 = 7,421.56/x
  3. Step 3: Cross multiply
    13,709.18x = 18,918.68 × 7,421.56
  4. Step 4: Simplify right side
    13,709.18x = 140,406,071.44
  5. Step 5: Solve for x
    x = 140,406,071.44/13,709.18
  6. Step 6: Final answer
    x = 10,241.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.