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Finding the Fourth Proportional to 310,276.72, 428,187.68 and 172,468.58

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Solution

The fourth proportional to 310,276.72, 428,187.68 and 172,468.58 is: 238,009.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,276.72 : 428,187.68 = 172,468.58 : x
  2. Step 2: Convert to fraction form
    310,276.72/428,187.68 = 172,468.58/x
  3. Step 3: Cross multiply
    310,276.72x = 428,187.68 × 172,468.58
  4. Step 4: Simplify right side
    310,276.72x = 73,848,920,280.75
  5. Step 5: Solve for x
    x = 73,848,920,280.75/310,276.72
  6. Step 6: Final answer
    x = 238,009.87

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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.