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Finding the Fourth Proportional to 620,608.10, 930,912.15 and 408,031.70

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Solution

The fourth proportional to 620,608.10, 930,912.15 and 408,031.70 is: 612,047.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,608.10 : 930,912.15 = 408,031.70 : x
  2. Step 2: Convert to fraction form
    620,608.10/930,912.15 = 408,031.70/x
  3. Step 3: Cross multiply
    620,608.10x = 930,912.15 × 408,031.70
  4. Step 4: Simplify right side
    620,608.10x = 379,841,667,115.16
  5. Step 5: Solve for x
    x = 379,841,667,115.16/620,608.10
  6. Step 6: Final answer
    x = 612,047.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.