Home / 19,138.50-28,708.11-5,287.86

Finding the Fourth Proportional to 19,138.50, 28,708.11 and 5,287.86

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Solution

The fourth proportional to 19,138.50, 28,708.11 and 5,287.86 is: 7,931.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,138.50 : 28,708.11 = 5,287.86 : x
  2. Step 2: Convert to fraction form
    19,138.50/28,708.11 = 5,287.86/x
  3. Step 3: Cross multiply
    19,138.50x = 28,708.11 × 5,287.86
  4. Step 4: Simplify right side
    19,138.50x = 151,804,466.54
  5. Step 5: Solve for x
    x = 151,804,466.54/19,138.50
  6. Step 6: Final answer
    x = 7,931.89

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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.