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Finding the Fourth Proportional to 18,719.82, 28,085.81 and 5,572.31

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Solution

The fourth proportional to 18,719.82, 28,085.81 and 5,572.31 is: 8,360.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.82 : 28,085.81 = 5,572.31 : x
  2. Step 2: Convert to fraction form
    18,719.82/28,085.81 = 5,572.31/x
  3. Step 3: Cross multiply
    18,719.82x = 28,085.81 × 5,572.31
  4. Step 4: Simplify right side
    18,719.82x = 156,502,671.63
  5. Step 5: Solve for x
    x = 156,502,671.63/18,719.82
  6. Step 6: Final answer
    x = 8,360.27

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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.