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Finding the Fourth Proportional to 878.68, 1,318.02 and 840.73

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Solution

The fourth proportional to 878.68, 1,318.02 and 840.73 is: 1,261.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.68 : 1,318.02 = 840.73 : x
  2. Step 2: Convert to fraction form
    878.68/1,318.02 = 840.73/x
  3. Step 3: Cross multiply
    878.68x = 1,318.02 × 840.73
  4. Step 4: Simplify right side
    878.68x = 1,108,088.16
  5. Step 5: Solve for x
    x = 1,108,088.16/878.68
  6. Step 6: Final answer
    x = 1,261.09

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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.