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Finding the Fourth Proportional to 13,318.72, 19,978.08 and 4,553.72

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Solution

The fourth proportional to 13,318.72, 19,978.08 and 4,553.72 is: 6,830.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,318.72 : 19,978.08 = 4,553.72 : x
  2. Step 2: Convert to fraction form
    13,318.72/19,978.08 = 4,553.72/x
  3. Step 3: Cross multiply
    13,318.72x = 19,978.08 × 4,553.72
  4. Step 4: Simplify right side
    13,318.72x = 90,974,582.46
  5. Step 5: Solve for x
    x = 90,974,582.46/13,318.72
  6. Step 6: Final answer
    x = 6,830.58

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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.