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Finding the Fourth Proportional to 312,129.72, 430,735.78 and 168,886.60

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Solution

The fourth proportional to 312,129.72, 430,735.78 and 168,886.60 is: 233,061.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,129.72 : 430,735.78 = 168,886.60 : x
  2. Step 2: Convert to fraction form
    312,129.72/430,735.78 = 168,886.60/x
  3. Step 3: Cross multiply
    312,129.72x = 430,735.78 × 168,886.60
  4. Step 4: Simplify right side
    312,129.72x = 72,745,501,382.55
  5. Step 5: Solve for x
    x = 72,745,501,382.55/312,129.72
  6. Step 6: Final answer
    x = 233,061.76

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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.