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Finding the Fourth Proportional to 315,859.20, 435,884.64 and 172,620.24

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Solution

The fourth proportional to 315,859.20, 435,884.64 and 172,620.24 is: 238,215.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,859.20 : 435,884.64 = 172,620.24 : x
  2. Step 2: Convert to fraction form
    315,859.20/435,884.64 = 172,620.24/x
  3. Step 3: Cross multiply
    315,859.20x = 435,884.64 × 172,620.24
  4. Step 4: Simplify right side
    315,859.20x = 75,242,511,169.11
  5. Step 5: Solve for x
    x = 75,242,511,169.11/315,859.20
  6. Step 6: Final answer
    x = 238,215.35

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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.