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Finding the Fourth Proportional to 318,638.60, 478,217.10 and 308,270.60

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Solution

The fourth proportional to 318,638.60, 478,217.10 and 308,270.60 is: 462,656.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,638.60 : 478,217.10 = 308,270.60 : x
  2. Step 2: Convert to fraction form
    318,638.60/478,217.10 = 308,270.60/x
  3. Step 3: Cross multiply
    318,638.60x = 478,217.10 × 308,270.60
  4. Step 4: Simplify right side
    318,638.60x = 147,420,272,347.26
  5. Step 5: Solve for x
    x = 147,420,272,347.26/318,638.60
  6. Step 6: Final answer
    x = 462,656.67

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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.