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Finding the Fourth Proportional to 14,387.62, 19,854.91 and 8,420.43

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Solution

The fourth proportional to 14,387.62, 19,854.91 and 8,420.43 is: 11,620.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,387.62 : 19,854.91 = 8,420.43 : x
  2. Step 2: Convert to fraction form
    14,387.62/19,854.91 = 8,420.43/x
  3. Step 3: Cross multiply
    14,387.62x = 19,854.91 × 8,420.43
  4. Step 4: Simplify right side
    14,387.62x = 167,186,879.81
  5. Step 5: Solve for x
    x = 167,186,879.81/14,387.62
  6. Step 6: Final answer
    x = 11,620.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.