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Finding the Fourth Proportional to 315,690.72, 435,683.21 and 172,472.29

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Solution

The fourth proportional to 315,690.72, 435,683.21 and 172,472.29 is: 238,028.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,690.72 : 435,683.21 = 172,472.29 : x
  2. Step 2: Convert to fraction form
    315,690.72/435,683.21 = 172,472.29/x
  3. Step 3: Cross multiply
    315,690.72x = 435,683.21 × 172,472.29
  4. Step 4: Simplify right side
    315,690.72x = 75,143,278,991.68
  5. Step 5: Solve for x
    x = 75,143,278,991.68/315,690.72
  6. Step 6: Final answer
    x = 238,028.16

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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.