Home / 13,390.14-18,478.35-7,421.75

Finding the Fourth Proportional to 13,390.14, 18,478.35 and 7,421.75

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Solution

The fourth proportional to 13,390.14, 18,478.35 and 7,421.75 is: 10,241.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.14 : 18,478.35 = 7,421.75 : x
  2. Step 2: Convert to fraction form
    13,390.14/18,478.35 = 7,421.75/x
  3. Step 3: Cross multiply
    13,390.14x = 18,478.35 × 7,421.75
  4. Step 4: Simplify right side
    13,390.14x = 137,141,657.00
  5. Step 5: Solve for x
    x = 137,141,657.00/13,390.14
  6. Step 6: Final answer
    x = 10,241.99

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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.