Home / 18,931.58-28,397.37-11,991.50

Finding the Fourth Proportional to 18,931.58, 28,397.37 and 11,991.50

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Solution

The fourth proportional to 18,931.58, 28,397.37 and 11,991.50 is: 17,987.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,931.58 : 28,397.37 = 11,991.50 : x
  2. Step 2: Convert to fraction form
    18,931.58/28,397.37 = 11,991.50/x
  3. Step 3: Cross multiply
    18,931.58x = 28,397.37 × 11,991.50
  4. Step 4: Simplify right side
    18,931.58x = 340,527,062.36
  5. Step 5: Solve for x
    x = 340,527,062.36/18,931.58
  6. Step 6: Final answer
    x = 17,987.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.