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Finding the Fourth Proportional to 674,630.56, 930,991.08 and 388,144.90

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Solution

The fourth proportional to 674,630.56, 930,991.08 and 388,144.90 is: 535,640.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    674,630.56 : 930,991.08 = 388,144.90 : x
  2. Step 2: Convert to fraction form
    674,630.56/930,991.08 = 388,144.90/x
  3. Step 3: Cross multiply
    674,630.56x = 930,991.08 × 388,144.90
  4. Step 4: Simplify right side
    674,630.56x = 361,359,439,647.49
  5. Step 5: Solve for x
    x = 361,359,439,647.49/674,630.56
  6. Step 6: Final answer
    x = 535,640.48

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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.