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Finding the Fourth Proportional to 318,905.61, 478,380.96 and 129,361.90

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Solution

The fourth proportional to 318,905.61, 478,380.96 and 129,361.90 is: 194,052.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,905.61 : 478,380.96 = 129,361.90 : x
  2. Step 2: Convert to fraction form
    318,905.61/478,380.96 = 129,361.90/x
  3. Step 3: Cross multiply
    318,905.61x = 478,380.96 × 129,361.90
  4. Step 4: Simplify right side
    318,905.61x = 61,884,272,328.80
  5. Step 5: Solve for x
    x = 61,884,272,328.80/318,905.61
  6. Step 6: Final answer
    x = 194,052.01

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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.