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Finding the Fourth Proportional to 318,630.40, 478,118.40 and 131,660.80

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Solution

The fourth proportional to 318,630.40, 478,118.40 and 131,660.80 is: 197,562.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,630.40 : 478,118.40 = 131,660.80 : x
  2. Step 2: Convert to fraction form
    318,630.40/478,118.40 = 131,660.80/x
  3. Step 3: Cross multiply
    318,630.40x = 478,118.40 × 131,660.80
  4. Step 4: Simplify right side
    318,630.40x = 62,949,451,038.72
  5. Step 5: Solve for x
    x = 62,949,451,038.72/318,630.40
  6. Step 6: Final answer
    x = 197,562.60

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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.