Home / 30,987.36-42,768.76-18,409.68

Finding the Fourth Proportional to 30,987.36, 42,768.76 and 18,409.68

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Solution

The fourth proportional to 30,987.36, 42,768.76 and 18,409.68 is: 25,409.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,987.36 : 42,768.76 = 18,409.68 : x
  2. Step 2: Convert to fraction form
    30,987.36/42,768.76 = 18,409.68/x
  3. Step 3: Cross multiply
    30,987.36x = 42,768.76 × 18,409.68
  4. Step 4: Simplify right side
    30,987.36x = 787,359,185.60
  5. Step 5: Solve for x
    x = 787,359,185.60/30,987.36
  6. Step 6: Final answer
    x = 25,409.04

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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.