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Finding the Fourth Proportional to 318,912, 478,368 and 131,928

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Solution

The fourth proportional to 318,912, 478,368 and 131,928 is: 197,892

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,912 : 478,368 = 131,928 : x
  2. Step 2: Convert to fraction form
    318,912/478,368 = 131,928/x
  3. Step 3: Cross multiply
    318,912x = 478,368 × 131,928
  4. Step 4: Simplify right side
    318,912x = 63,110,133,504
  5. Step 5: Solve for x
    x = 63,110,133,504/318,912
  6. Step 6: Final answer
    x = 197,892

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.