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Finding the Fourth Proportional to 917.70, 1,377.09 and 878.55

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Solution

The fourth proportional to 917.70, 1,377.09 and 878.55 is: 1,318.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.70 : 1,377.09 = 878.55 : x
  2. Step 2: Convert to fraction form
    917.70/1,377.09 = 878.55/x
  3. Step 3: Cross multiply
    917.70x = 1,377.09 × 878.55
  4. Step 4: Simplify right side
    917.70x = 1,209,842.42
  5. Step 5: Solve for x
    x = 1,209,842.42/917.70
  6. Step 6: Final answer
    x = 1,318.34

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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.