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Finding the Fourth Proportional to 18,987.25, 28,491.15 and 7,901.59

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Solution

The fourth proportional to 18,987.25, 28,491.15 and 7,901.59 is: 11,856.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.25 : 28,491.15 = 7,901.59 : x
  2. Step 2: Convert to fraction form
    18,987.25/28,491.15 = 7,901.59/x
  3. Step 3: Cross multiply
    18,987.25x = 28,491.15 × 7,901.59
  4. Step 4: Simplify right side
    18,987.25x = 225,125,203.96
  5. Step 5: Solve for x
    x = 225,125,203.96/18,987.25
  6. Step 6: Final answer
    x = 11,856.65

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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.