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Finding the Fourth Proportional to 878.04, 1,211.66 and 485.06

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Solution

The fourth proportional to 878.04, 1,211.66 and 485.06 is: 669.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.04 : 1,211.66 = 485.06 : x
  2. Step 2: Convert to fraction form
    878.04/1,211.66 = 485.06/x
  3. Step 3: Cross multiply
    878.04x = 1,211.66 × 485.06
  4. Step 4: Simplify right side
    878.04x = 587,721.13
  5. Step 5: Solve for x
    x = 587,721.13/878.04
  6. Step 6: Final answer
    x = 669.36

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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.