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Finding the Fourth Proportional to 318,759.15, 478,138.21 and 218,615.74

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Solution

The fourth proportional to 318,759.15, 478,138.21 and 218,615.74 is: 327,923.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,759.15 : 478,138.21 = 218,615.74 : x
  2. Step 2: Convert to fraction form
    318,759.15/478,138.21 = 218,615.74/x
  3. Step 3: Cross multiply
    318,759.15x = 478,138.21 × 218,615.74
  4. Step 4: Simplify right side
    318,759.15x = 104,528,538,526.35
  5. Step 5: Solve for x
    x = 104,528,538,526.35/318,759.15
  6. Step 6: Final answer
    x = 327,923.26

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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.