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Finding the Fourth Proportional to 12,913.60, 19,351.92 and 7,355.47

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Solution

The fourth proportional to 12,913.60, 19,351.92 and 7,355.47 is: 11,022.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,913.60 : 19,351.92 = 7,355.47 : x
  2. Step 2: Convert to fraction form
    12,913.60/19,351.92 = 7,355.47/x
  3. Step 3: Cross multiply
    12,913.60x = 19,351.92 × 7,355.47
  4. Step 4: Simplify right side
    12,913.60x = 142,342,467.00
  5. Step 5: Solve for x
    x = 142,342,467.00/12,913.60
  6. Step 6: Final answer
    x = 11,022.68

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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.