Home / 13,390.92-18,479.64-7,422.72

Finding the Fourth Proportional to 13,390.92, 18,479.64 and 7,422.72

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Solution

The fourth proportional to 13,390.92, 18,479.64 and 7,422.72 is: 10,243.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.92 : 18,479.64 = 7,422.72 : x
  2. Step 2: Convert to fraction form
    13,390.92/18,479.64 = 7,422.72/x
  3. Step 3: Cross multiply
    13,390.92x = 18,479.64 × 7,422.72
  4. Step 4: Simplify right side
    13,390.92x = 137,169,193.42
  5. Step 5: Solve for x
    x = 137,169,193.42/13,390.92
  6. Step 6: Final answer
    x = 10,243.45

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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.