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Finding the Fourth Proportional to 316,221.20, 436,380.60 and 172,977.68

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Solution

The fourth proportional to 316,221.20, 436,380.60 and 172,977.68 is: 238,706.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,221.20 : 436,380.60 = 172,977.68 : x
  2. Step 2: Convert to fraction form
    316,221.20/436,380.60 = 172,977.68/x
  3. Step 3: Cross multiply
    316,221.20x = 436,380.60 × 172,977.68
  4. Step 4: Simplify right side
    316,221.20x = 75,484,103,785.01
  5. Step 5: Solve for x
    x = 75,484,103,785.01/316,221.20
  6. Step 6: Final answer
    x = 238,706.65

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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.