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Finding the Fourth Proportional to 315,449.78, 435,327.28 and 172,215.86

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Solution

The fourth proportional to 315,449.78, 435,327.28 and 172,215.86 is: 237,661.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,449.78 : 435,327.28 = 172,215.86 : x
  2. Step 2: Convert to fraction form
    315,449.78/435,327.28 = 172,215.86/x
  3. Step 3: Cross multiply
    315,449.78x = 435,327.28 × 172,215.86
  4. Step 4: Simplify right side
    315,449.78x = 74,970,259,299.48
  5. Step 5: Solve for x
    x = 74,970,259,299.48/315,449.78
  6. Step 6: Final answer
    x = 237,661.48

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1.5x scale

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.