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Finding the Fourth Proportional to 64,296.78, 96,409.93 and 19,911.21

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Solution

The fourth proportional to 64,296.78, 96,409.93 and 19,911.21 is: 29,855.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,296.78 : 96,409.93 = 19,911.21 : x
  2. Step 2: Convert to fraction form
    64,296.78/96,409.93 = 19,911.21/x
  3. Step 3: Cross multiply
    64,296.78x = 96,409.93 × 19,911.21
  4. Step 4: Simplify right side
    64,296.78x = 1,919,637,880.27
  5. Step 5: Solve for x
    x = 1,919,637,880.27/64,296.78
  6. Step 6: Final answer
    x = 29,855.90

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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.