Home / 13,390.81-18,478.65-7,422.43

Finding the Fourth Proportional to 13,390.81, 18,478.65 and 7,422.43

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Solution

The fourth proportional to 13,390.81, 18,478.65 and 7,422.43 is: 10,242.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.81 : 18,478.65 = 7,422.43 : x
  2. Step 2: Convert to fraction form
    13,390.81/18,478.65 = 7,422.43/x
  3. Step 3: Cross multiply
    13,390.81x = 18,478.65 × 7,422.43
  4. Step 4: Simplify right side
    13,390.81x = 137,156,486.12
  5. Step 5: Solve for x
    x = 137,156,486.12/13,390.81
  6. Step 6: Final answer
    x = 10,242.58

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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.