Home / 13,390.40-18,478.56-7,422.08

Finding the Fourth Proportional to 13,390.40, 18,478.56 and 7,422.08

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Solution

The fourth proportional to 13,390.40, 18,478.56 and 7,422.08 is: 10,242.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.40 : 18,478.56 = 7,422.08 : x
  2. Step 2: Convert to fraction form
    13,390.40/18,478.56 = 7,422.08/x
  3. Step 3: Cross multiply
    13,390.40x = 18,478.56 × 7,422.08
  4. Step 4: Simplify right side
    13,390.40x = 137,149,350.60
  5. Step 5: Solve for x
    x = 137,149,350.60/13,390.40
  6. Step 6: Final answer
    x = 10,242.36

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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.