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Finding the Fourth Proportional to 118,272, 163,213.12 and 64,556.80

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Solution

The fourth proportional to 118,272, 163,213.12 and 64,556.80 is: 89,087.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,272 : 163,213.12 = 64,556.80 : x
  2. Step 2: Convert to fraction form
    118,272/163,213.12 = 64,556.80/x
  3. Step 3: Cross multiply
    118,272x = 163,213.12 × 64,556.80
  4. Step 4: Simplify right side
    118,272x = 10,536,516,745.22
  5. Step 5: Solve for x
    x = 10,536,516,745.22/118,272
  6. Step 6: Final answer
    x = 89,087.16

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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.