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Finding the Fourth Proportional to 311,893.21, 430,415.20 and 172,196.30

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Solution

The fourth proportional to 311,893.21, 430,415.20 and 172,196.30 is: 237,632.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,893.21 : 430,415.20 = 172,196.30 : x
  2. Step 2: Convert to fraction form
    311,893.21/430,415.20 = 172,196.30/x
  3. Step 3: Cross multiply
    311,893.21x = 430,415.20 × 172,196.30
  4. Step 4: Simplify right side
    311,893.21x = 74,115,904,903.76
  5. Step 5: Solve for x
    x = 74,115,904,903.76/311,893.21
  6. Step 6: Final answer
    x = 237,632.31

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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.