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Finding the Fourth Proportional to 315,871.28, 435,902.41 and 172,631.28

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Solution

The fourth proportional to 315,871.28, 435,902.41 and 172,631.28 is: 238,231.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,871.28 : 435,902.41 = 172,631.28 : x
  2. Step 2: Convert to fraction form
    315,871.28/435,902.41 = 172,631.28/x
  3. Step 3: Cross multiply
    315,871.28x = 435,902.41 × 172,631.28
  4. Step 4: Simplify right side
    315,871.28x = 75,250,390,993.38
  5. Step 5: Solve for x
    x = 75,250,390,993.38/315,871.28
  6. Step 6: Final answer
    x = 238,231.19

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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.