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Finding the Fourth Proportional to 878.53, 1,212.36 and 485.55

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Solution

The fourth proportional to 878.53, 1,212.36 and 485.55 is: 670.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.53 : 1,212.36 = 485.55 : x
  2. Step 2: Convert to fraction form
    878.53/1,212.36 = 485.55/x
  3. Step 3: Cross multiply
    878.53x = 1,212.36 × 485.55
  4. Step 4: Simplify right side
    878.53x = 588,661.40
  5. Step 5: Solve for x
    x = 588,661.40/878.53
  6. Step 6: Final answer
    x = 670.05

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.