Home / 18,988.56-28,479.48-5,138.64

Finding the Fourth Proportional to 18,988.56, 28,479.48 and 5,138.64

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Solution

The fourth proportional to 18,988.56, 28,479.48 and 5,138.64 is: 7,707.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.56 : 28,479.48 = 5,138.64 : x
  2. Step 2: Convert to fraction form
    18,988.56/28,479.48 = 5,138.64/x
  3. Step 3: Cross multiply
    18,988.56x = 28,479.48 × 5,138.64
  4. Step 4: Simplify right side
    18,988.56x = 146,345,795.11
  5. Step 5: Solve for x
    x = 146,345,795.11/18,988.56
  6. Step 6: Final answer
    x = 7,707.05

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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.