Home / 13,390.07-18,478.11-7,421.61

Finding the Fourth Proportional to 13,390.07, 18,478.11 and 7,421.61

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Solution

The fourth proportional to 13,390.07, 18,478.11 and 7,421.61 is: 10,241.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.07 : 18,478.11 = 7,421.61 : x
  2. Step 2: Convert to fraction form
    13,390.07/18,478.11 = 7,421.61/x
  3. Step 3: Cross multiply
    13,390.07x = 18,478.11 × 7,421.61
  4. Step 4: Simplify right side
    13,390.07x = 137,137,196.46
  5. Step 5: Solve for x
    x = 137,137,196.46/13,390.07
  6. Step 6: Final answer
    x = 10,241.71

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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.