Home / 30,720.36-42,394.14-18,147.72

Finding the Fourth Proportional to 30,720.36, 42,394.14 and 18,147.72

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Solution

The fourth proportional to 30,720.36, 42,394.14 and 18,147.72 is: 25,043.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720.36 : 42,394.14 = 18,147.72 : x
  2. Step 2: Convert to fraction form
    30,720.36/42,394.14 = 18,147.72/x
  3. Step 3: Cross multiply
    30,720.36x = 42,394.14 × 18,147.72
  4. Step 4: Simplify right side
    30,720.36x = 769,356,982.36
  5. Step 5: Solve for x
    x = 769,356,982.36/30,720.36
  6. Step 6: Final answer
    x = 25,043.88

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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.