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Finding the Fourth Proportional to 315,878.34, 435,912.12 and 172,638.36

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Solution

The fourth proportional to 315,878.34, 435,912.12 and 172,638.36 is: 238,240.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,878.34 : 435,912.12 = 172,638.36 : x
  2. Step 2: Convert to fraction form
    315,878.34/435,912.12 = 172,638.36/x
  3. Step 3: Cross multiply
    315,878.34x = 435,912.12 × 172,638.36
  4. Step 4: Simplify right side
    315,878.34x = 75,255,153,500.92
  5. Step 5: Solve for x
    x = 75,255,153,500.92/315,878.34
  6. Step 6: Final answer
    x = 238,240.94

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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.