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Finding the Fourth Proportional to 620,667.10, 931,000.65 and 408,090.70

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Solution

The fourth proportional to 620,667.10, 931,000.65 and 408,090.70 is: 612,136.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,667.10 : 931,000.65 = 408,090.70 : x
  2. Step 2: Convert to fraction form
    620,667.10/931,000.65 = 408,090.70/x
  3. Step 3: Cross multiply
    620,667.10x = 931,000.65 × 408,090.70
  4. Step 4: Simplify right side
    620,667.10x = 379,932,706,958.96
  5. Step 5: Solve for x
    x = 379,932,706,958.96/620,667.10
  6. Step 6: Final answer
    x = 612,136.05

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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.