Home / 30,987.20-42,762.20-18,240.27

Finding the Fourth Proportional to 30,987.20, 42,762.20 and 18,240.27

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Solution

The fourth proportional to 30,987.20, 42,762.20 and 18,240.27 is: 25,171.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,987.20 : 42,762.20 = 18,240.27 : x
  2. Step 2: Convert to fraction form
    30,987.20/42,762.20 = 18,240.27/x
  3. Step 3: Cross multiply
    30,987.20x = 42,762.20 × 18,240.27
  4. Step 4: Simplify right side
    30,987.20x = 779,993,982.59
  5. Step 5: Solve for x
    x = 779,993,982.59/30,987.20
  6. Step 6: Final answer
    x = 25,171.49

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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.