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Finding the Fourth Proportional to 878.83, 1,212.73 and 485.89

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Solution

The fourth proportional to 878.83, 1,212.73 and 485.89 is: 670.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.83 : 1,212.73 = 485.89 : x
  2. Step 2: Convert to fraction form
    878.83/1,212.73 = 485.89/x
  3. Step 3: Cross multiply
    878.83x = 1,212.73 × 485.89
  4. Step 4: Simplify right side
    878.83x = 589,253.38
  5. Step 5: Solve for x
    x = 589,253.38/878.83
  6. Step 6: Final answer
    x = 670.50

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1.5x scale

Why These Related Problems?

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